-- Lean 4 proof step from Mathlib.Geometry.RingedSpace.PresheafedSpace.HasColimits (hypothesis)
Goal:
J : Type u'
inst : Category.{v', u'} J
C : Type u
inst_1 : Category.{v, u} C
inst_2 : HasColimitsOfShape.{v', u', v, v + 1} J TopCat
inst_3 : ∀ (X : TopCat.{v}), HasLimitsOfShape Jᵒᵖ (Presheaf C X)
inst_4 : HasLimitsOfShape.{v', u', v, u} Jᵒᵖ C
F : J ⥤ PresheafedSpace.{v, u, v} C
s : Cocone F
U V : (Opens (↑(↑s.pt : TopCat) : Type v))ᵒᵖ
i : U ⟶ V
j : Jᵒᵖ
⊢ Eq (α :=
    s.pt.presheaf.obj U ⟶
      obj (C := (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ)
        (obj
            (Functor.leftOp (pushforwardDiagramToColimit F) :
              Jᵒᵖ ⥤ Presheaf.{v, v, u} C (Limits.colimit (F ⋙ forget C)))
            j :
          CategoryTheory.Functor.{v, v, v, u} (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C)
        (op (obj (Opens.map (colimit.desc (F ⋙ forget C) (mapCocone (forget C) s))) (unop V)) :
          (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ))
    (CategoryStruct.comp (Y :=
        obj (C := (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ)
          (limit
              (Functor.leftOp (pushforwardDiagramToColimit F) :
                Jᵒᵖ ⥤ Presheaf.{v, v, u} C (Limits.colimit (F ⋙ forget C))) :
            CategoryTheory.Functor.{v, v, v, u} (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C)
          (op (obj (Opens.map (colimit.desc (F ⋙ forget C) (mapCocone (forget C) s))) (unop V)) :
            (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ))
        (s.pt.presheaf.map i ≫
            CategoryStruct.comp (Y :=
              limit
                (Functor.comp (D :=
                  CategoryTheory.Functor.{v, v, v, u} (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C)
                  (Functor.leftOp (pushforwardDiagramToColimit F) :
                    Jᵒᵖ ⥤ Presheaf.{v, v, u} C (Limits.colimit (F ⋙ forget C)))
                  (obj (evaluation (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C)
                      (op (obj (Opens.map (colimit.desc (F ⋙ forget C) (mapCocone (forget C) s))) (unop V))) :
                    CategoryTheory.Functor.{v, v, v, u} (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C ⥤ C)))
              (limit.lift
                  (Functor.comp (D :=
                    CategoryTheory.Functor.{v, v, v, u} (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C)
                    (Functor.leftOp (pushforwardDiagramToColimit F) :
                      Jᵒᵖ ⥤ Presheaf.{v, v, u} C (Limits.colimit (F ⋙ forget C)))
                    (obj (evaluation (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C)
                        (op (obj (Opens.map (colimit.desc (F ⋙ forget C) (mapCocone (forget C) s))) (unop V))) :
                      CategoryTheory.Functor.{v, v, v, u} (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C ⥤ C))
                  { pt := s.pt.presheaf.obj V,
                    π :=
                      {
                        app := fun (j : Jᵒᵖ) ↦
                          NatTrans.app (Hom.c (s.ι.app (unop j))) V ≫ (F.obj (unop j)).presheaf.map (eqToHom ⋯),
                        naturality := ⋯ :
                        NatTrans (obj (Functor.const Jᵒᵖ) (s.pt.presheaf.obj V))
                          (Functor.comp (D :=
                            CategoryTheory.Functor.{v, v, v, u} (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C)
                            (Functor.leftOp (pushforwardDiagramToColimit F) :
                              Jᵒᵖ ⥤ Presheaf.{v, v, u} C (Limits.colimit (F ⋙ forget C)))
                            (obj (evaluation (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C)
                                (op (obj (Opens.map (colimit.desc (F ⋙ forget C) (mapCocone (forget C) s))) (unop V))) :
                              CategoryTheory.Functor.{v, v, v, u} (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ
                                  C ⥤
                                C)) } } :
                Cone.pt (F :=
                    Functor.comp (D :=
                      CategoryTheory.Functor.{v, v, v, u} (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C)
                      (Functor.leftOp (pushforwardDiagramToColimit F) :
                        Jᵒᵖ ⥤ Presheaf.{v, v, u} C (Limits.colimit (F ⋙ forget C)))
                      (obj (evaluation (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C)
                          (op (obj (Opens.map (colimit.desc (F ⋙ forget C) (mapCocone (forget C) s))) (unop V))) :
                        CategoryTheory.Functor.{v, v, v, u} (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C ⥤
                          C))
                    { pt := s.pt.presheaf.obj V,
                      π :=
                        {
                          app := fun (j : Jᵒᵖ) ↦
                            NatTrans.app (Hom.c (s.ι.app (unop j))) V ≫ (F.obj (unop j)).presheaf.map (eqToHom ⋯),
                          naturality := ⋯ :
                          NatTrans (obj (Functor.const Jᵒᵖ) (s.pt.presheaf.obj V))
                            (Functor.comp (D :=
                              CategoryTheory.Functor.{v, v, v, u} (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ
                                C)
                              (Functor.leftOp (pushforwardDiagramToColimit F) :
                                Jᵒᵖ ⥤ Presheaf.{v, v, u} C (Limits.colimit (F ⋙ forget C)))
                              (obj (evaluation (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C)
                                  (op
                                    (obj (Opens.map (colimit.desc (F ⋙ forget C) (mapCocone (forget C) s))) (unop V))) :
                                CategoryTheory.Functor.{v, v, v, u}
                                    (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C ⥤
                                  C)) } :
                      Cone
                        (Functor.comp (D :=
                          CategoryTheory.Functor.{v, v, v, u} (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C)
                          (Functor.leftOp (pushforwardDiagramToColimit F) :
                            Jᵒᵖ ⥤ Presheaf.{v, v, u} C (Limits.colimit (F ⋙ forget C)))
                          (obj (evaluation (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C)
                              (op (obj (Opens.map (colimit.desc (F ⋙ forget C) (mapCocone (forget C) s))) (unop V))) :
                            CategoryTheory.Functor.{v, v, v, u} (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ
                                C ⥤
                              C)) } ⟶
                  limit
                    (Functor.comp (D :=
                      CategoryTheory.Functor.{v, v, v, u} (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C)
                      (Functor.leftOp (pushforwardDiagramToColimit F) :
                        Jᵒᵖ ⥤ Presheaf.{v, v, u} C (Limits.colimit (F ⋙ forget C)))
                      (obj (evaluation (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C)
                          (op (obj (Opens.map (colimit.desc (F ⋙ forget C) (mapCocone (forget C) s))) (unop V))) :
                        CategoryTheory.Functor.{v, v, v, u} (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C ⥤
                          C)))
              (Iso.inv
                  (limitObjIsoLimitCompEvaluation (Functor.leftOp (pushforwardDiagramToColimit F))
                    (op (obj (Opens.map (colimit.desc (F ⋙ forget C) (mapCocone (forget C) s))) (unop V)))) :
                limit
                    (Functor.comp (D :=
                      CategoryTheory.Functor.{v, v, v, u} (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C)
                      (Functor.leftOp (pushforwardDiagramToColimit F) :
                        Jᵒᵖ ⥤ Presheaf.{v, v, u} C (Limits.colimit (F ⋙ forget C)))
                      (obj (evaluation (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C)
                          (op (obj (Opens.map (colimit.desc (F ⋙ forget C) (mapCocone (forget C) s))) (unop V))) :
                        CategoryTheory.Functor.{v, v, v, u} (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C ⥤
                          C)) ⟶
                  obj (C := (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ)
                    (limit
                        (Functor.leftOp (pushforwardDiagramToColimit F) :
                          Jᵒᵖ ⥤ Presheaf.{v, v, u} C (Limits.colimit (F ⋙ forget C))) :
                      CategoryTheory.Functor.{v, v, v, u} (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C)
                    (op (obj (Opens.map (colimit.desc (F ⋙ forget C) (mapCocone (forget C) s))) (unop V)) :
                      (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ)) :
          s.pt.presheaf.obj U ⟶
            obj (C := (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ)
              (limit
                  (Functor.leftOp (pushforwardDiagramToColimit F) :
                    Jᵒᵖ ⥤ Presheaf.{v, v, u} C (Limits.colimit (F ⋙ forget C))) :
                Presheaf.{v, v, u} C (Limits.colimit (F ⋙ forget C)))
              (op (obj (Opens.map (colimit.desc (F ⋙ forget C) (mapCocone (forget C) s))) (unop V)) :
                (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ))
        (NatTrans.app (limit.π (Functor.leftOp (pushforwardDiagramToColimit F)) j)
            (op (obj (Opens.map (colimit.desc (F ⋙ forget C) (mapCocone (forget C) s))) (unop V))) :
          obj (C := (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ)
              (limit
                  (Functor.leftOp (pushforwardDiagramToColimit F) :
                    Jᵒᵖ ⥤ Presheaf.{v, v, u} C (Limits.colimit (F ⋙ forget C))) :
                CategoryTheory.Functor.{v, v, v, u} (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C)
              (op (obj (Opens.map (colimit.desc (F ⋙ forget C) (mapCocone (forget C) s))) (unop V)) :
                (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ) ⟶
            obj (C := (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ)
              (obj
                  (Functor.leftOp (pushforwardDiagramToColimit F) :
                    Jᵒᵖ ⥤ Presheaf.{v, v, u} C (Limits.colimit (F ⋙ forget C)))
                  j :
                CategoryTheory.Functor.{v, v, v, u} (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C)
              (op (obj (Opens.map (colimit.desc (F ⋙ forget C) (mapCocone (forget C) s))) (unop V)) :
                (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ)) :
      s.pt.presheaf.obj U ⟶
        obj (C := (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ)
          (obj
              (Functor.leftOp (pushforwardDiagramToColimit F) :
                Jᵒᵖ ⥤ Presheaf.{v, v, u} C (Limits.colimit (F ⋙ forget C)))
              j :
            CategoryTheory.Functor.{v, v, v, u} (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C)
          (op (obj (Opens.map (colimit.desc (F ⋙ forget C) (mapCocone (forget C) s))) (unop V)) :
            (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ))
    (CategoryStruct.comp (Y :=
        obj (C := (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ)
          (limit
              (Functor.leftOp (pushforwardDiagramToColimit F) :
                Jᵒᵖ ⥤ Presheaf.{v, v, u} C (Limits.colimit (F ⋙ forget C))) :
            CategoryTheory.Functor.{v, v, v, u} (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C)
          (op (obj (Opens.map (colimit.desc (F ⋙ forget C) (mapCocone (forget C) s))) (unop V)) :
            (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ))
        (CategoryStruct.comp (Y :=
            obj (C := (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ)
              (limit
                  (Functor.leftOp (pushforwardDiagramToColimit F) :
                    Jᵒᵖ ⥤ Presheaf.{v, v, u} C (Limits.colimit (F ⋙ forget C))) :
                Presheaf.{v, v, u} C (Limits.colimit (F ⋙ forget C)))
              (op (obj (Opens.map (colimit.desc (F ⋙ forget C) (mapCocone (forget C) s))) (unop U)) :
                (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ))
            (CategoryStruct.comp (Y :=
              limit
                (Functor.comp (D :=
                  CategoryTheory.Functor.{v, v, v, u} (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C)
                  (Functor.leftOp (pushforwardDiagramToColimit F) :
                    Jᵒᵖ ⥤ Presheaf.{v, v, u} C (Limits.colimit (F ⋙ forget C)))
                  (obj (evaluation (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C)
                      (op (obj (Opens.map (colimit.desc (F ⋙ forget C) (mapCocone (forget C) s))) (unop U))) :
                    CategoryTheory.Functor.{v, v, v, u} (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C ⥤ C)))
              (limit.lift
                  (Functor.comp (D :=
                    CategoryTheory.Functor.{v, v, v, u} (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C)
                    (Functor.leftOp (pushforwardDiagramToColimit F) :
                      Jᵒᵖ ⥤ Presheaf.{v, v, u} C (Limits.colimit (F ⋙ forget C)))
                    (obj (evaluation (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C)
                        (op (obj (Opens.map (colimit.desc (F ⋙ forget C) (mapCocone (forget C) s))) (unop U))) :
                      CategoryTheory.Functor.{v, v, v, u} (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C ⥤ C))
                  { pt := s.pt.presheaf.obj U,
                    π :=
                      {
                        app := fun (j : Jᵒᵖ) ↦
                          NatTrans.app (Hom.c (s.ι.app (unop j))) U ≫ (F.obj (unop j)).presheaf.map (eqToHom ⋯),
                        naturality := ⋯ :
                        NatTrans (obj (Functor.const Jᵒᵖ) (s.pt.presheaf.obj U))
                          (Functor.comp (D :=
                            CategoryTheory.Functor.{v, v, v, u} (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C)
                            (Functor.leftOp (pushforwardDiagramToColimit F) :
                              Jᵒᵖ ⥤ Presheaf.{v, v, u} C (Limits.colimit (F ⋙ forget C)))
                            (obj (evaluation (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C)
                                (op (obj (Opens.map (colimit.desc (F ⋙ forget C) (mapCocone (forget C) s))) (unop U))) :
                              CategoryTheory.Functor.{v, v, v, u} (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ
                                  C ⥤
                                C)) } } :
                Cone.pt (F :=
                    Functor.comp (D :=
                      CategoryTheory.Functor.{v, v, v, u} (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C)
                      (Functor.leftOp (pushforwardDiagramToColimit F) :
                        Jᵒᵖ ⥤ Presheaf.{v, v, u} C (Limits.colimit (F ⋙ forget C)))
                      (obj (evaluation (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C)
                          (op (obj (Opens.map (colimit.desc (F ⋙ forget C) (mapCocone (forget C) s))) (unop U))) :
                        CategoryTheory.Functor.{v, v, v, u} (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C ⥤
                          C))
                    { pt := s.pt.presheaf.obj U,
                      π :=
                        {
                          app := fun (j : Jᵒᵖ) ↦
                            NatTrans.app (Hom.c (s.ι.app (unop j))) U ≫ (F.obj (unop j)).presheaf.map (eqToHom ⋯),
                          naturality := ⋯ :
                          NatTrans (obj (Functor.const Jᵒᵖ) (s.pt.presheaf.obj U))
                            (Functor.comp (D :=
                              CategoryTheory.Functor.{v, v, v, u} (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ
                                C)
                              (Functor.leftOp (pushforwardDiagramToColimit F) :
                                Jᵒᵖ ⥤ Presheaf.{v, v, u} C (Limits.colimit (F ⋙ forget C)))
                              (obj (evaluation (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C)
                                  (op
                                    (obj (Opens.map (colimit.desc (F ⋙ forget C) (mapCocone (forget C) s))) (unop U))) :
                                CategoryTheory.Functor.{v, v, v, u}
                                    (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C ⥤
                                  C)) } :
                      Cone
                        (Functor.comp (D :=
                          CategoryTheory.Functor.{v, v, v, u} (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C)
                          (Functor.leftOp (pushforwardDiagramToColimit F) :
                            Jᵒᵖ ⥤ Presheaf.{v, v, u} C (Limits.colimit (F ⋙ forget C)))
                          (obj (evaluation (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C)
                              (op (obj (Opens.map (colimit.desc (F ⋙ forget C) (mapCocone (forget C) s))) (unop U))) :
                            CategoryTheory.Functor.{v, v, v, u} (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ
                                C ⥤
                              C)) } ⟶
                  limit
                    (Functor.comp (D :=
                      CategoryTheory.Functor.{v, v, v, u} (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C)
                      (Functor.leftOp (pushforwardDiagramToColimit F) :
                        Jᵒᵖ ⥤ Presheaf.{v, v, u} C (Limits.colimit (F ⋙ forget C)))
                      (obj (evaluation (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C)
                          (op (obj (Opens.map (colimit.desc (F ⋙ forget C) (mapCocone (forget C) s))) (unop U))) :
                        CategoryTheory.Functor.{v, v, v, u} (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C ⥤
                          C)))
              (Iso.inv
                  (limitObjIsoLimitCompEvaluation (Functor.leftOp (pushforwardDiagramToColimit F))
                    (op (obj (Opens.map (colimit.desc (F ⋙ forget C) (mapCocone (forget C) s))) (unop U)))) :
                limit
                    (Functor.comp (D :=
                      CategoryTheory.Functor.{v, v, v, u} (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C)
                      (Functor.leftOp (pushforwardDiagramToColimit F) :
                        Jᵒᵖ ⥤ Presheaf.{v, v, u} C (Limits.colimit (F ⋙ forget C)))
                      (obj (evaluation (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C)
                          (op (obj (Opens.map (colimit.desc (F ⋙ forget C) (mapCocone (forget C) s))) (unop U))) :
                        CategoryTheory.Functor.{v, v, v, u} (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C ⥤
                          C)) ⟶
                  obj (C := (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ)
                    (limit
                        (Functor.leftOp (pushforwardDiagramToColimit F) :
                          Jᵒᵖ ⥤ Presheaf.{v, v, u} C (Limits.colimit (F ⋙ forget C))) :
                      CategoryTheory.Functor.{v, v, v, u} (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C)
                    (op (obj (Opens.map (colimit.desc (F ⋙ forget C) (mapCocone (forget C) s))) (unop U)) :
                      (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ)))
            (map
              (limit
                (Functor.leftOp (pushforwardDiagramToColimit F) :
                  Jᵒᵖ ⥤ Presheaf.{v, v, u} C (Limits.colimit (F ⋙ forget C))))
              (Quiver.Hom.op (map (Opens.map (colimit.desc (F ⋙ forget C) (mapCocone (forget C) s))) i.unop))) :
          s.pt.presheaf.obj U ⟶
            obj (C := (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ)
              (limit
                  (Functor.leftOp (pushforwardDiagramToColimit F) :
                    Jᵒᵖ ⥤ Presheaf.{v, v, u} C (Limits.colimit (F ⋙ forget C))) :
                Presheaf.{v, v, u} C (Limits.colimit (F ⋙ forget C)))
              (op (obj (Opens.map (colimit.desc (F ⋙ forget C) (mapCocone (forget C) s))) (unop V)) :
                (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ))
        (NatTrans.app (limit.π (Functor.leftOp (pushforwardDiagramToColimit F)) j)
            (op (obj (Opens.map (colimit.desc (F ⋙ forget C) (mapCocone (forget C) s))) (unop V))) :
          obj (C := (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ)
              (limit
                  (Functor.leftOp (pushforwardDiagramToColimit F) :
                    Jᵒᵖ ⥤ Presheaf.{v, v, u} C (Limits.colimit (F ⋙ forget C))) :
                CategoryTheory.Functor.{v, v, v, u} (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C)
              (op (obj (Opens.map (colimit.desc (F ⋙ forget C) (mapCocone (forget C) s))) (unop V)) :
                (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ) ⟶
            obj (C := (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ)
              (obj
                  (Functor.leftOp (pushforwardDiagramToColimit F) :
                    Jᵒᵖ ⥤ Presheaf.{v, v, u} C (Limits.colimit (F ⋙ forget C)))
                  j :
                CategoryTheory.Functor.{v, v, v, u} (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C)
              (op (obj (Opens.map (colimit.desc (F ⋙ forget C) (mapCocone (forget C) s))) (unop V)) :
                (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ)) :
      s.pt.presheaf.obj U ⟶
        obj (C := (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ)
          (obj
              (Functor.leftOp (pushforwardDiagramToColimit F) :
                Jᵒᵖ ⥤ Presheaf.{v, v, u} C (Limits.colimit (F ⋙ forget C)))
              j :
            CategoryTheory.Functor.{v, v, v, u} (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ C)
          (op (obj (Opens.map (colimit.desc (F ⋙ forget C) (mapCocone (forget C) s))) (unop V)) :
            (Opens (↑(Limits.colimit (F ⋙ forget C)) : Type v))ᵒᵖ))
have w : Eq (α :=
  Quiver.Hom (V := Opens (↑((F ⋙ forget C).obj (unop j)) : Type v))
    (obj
      (Opens.map
        (CategoryStruct.comp (Y := Limits.colimit (F ⋙ forget C)) (colimit.ι (F ⋙ forget C) (unop j))
          (colimit.desc (F ⋙ forget C) (mapCocone (forget C) s))))
      (unop V))
    (obj
      (Opens.map
        (CategoryStruct.comp (Y := Limits.colimit (F ⋙ forget C)) (colimit.ι (F ⋙ forget C) (unop j))
          (colimit.desc (F ⋙ forget C) (mapCocone (forget C) s))))
      (unop U)))
  (map
    (Opens.map
      (CategoryStruct.comp (Y := Limits.colimit (F ⋙ forget C)) (colimit.ι (F ⋙ forget C) (unop j))
        (colimit.desc (F ⋙ forget C) (mapCocone (forget C) s))))
    i.unop)
  (eqToHom sorry ≫ map (Opens.map (NatTrans.app (Cocone.ι (mapCocone (forget C) s)) (unop j))) i.unop ≫ eqToHom sorry)
Tactic: have w := Functor.congr_hom (congr_arg Opens.map
    (colimit.ι_desc ((PresheafedSpace.forget C).mapCocone s) (unop j))) i.unop