theorem balance_eq_balance' {l x r} (hl : Balanced l) (hr : Balanced r) (sl : Sized l)
    (sr : Sized r) : @balance α l x r = balance' l x r := by
  cases' l with ls ll lx lr
  · cases' r with rs rl rx rr
    · rfl
    · rw [sr.eq_node'] at hr ⊢
      cases' rl with rls rll rlx rlr <;> cases' rr with rrs rrl rrx rrr <;>
        dsimp [balance, balance']
      · rfl
      · have : size rrl = 0 ∧ size rrr = 0 := by
          have := balancedSz_zero.1 hr.1.symm
          rwa [size, sr.2.2.1, Nat.succ_le_succ_iff, le_zero_iff, add_eq_zero_iff] at this
        cases sr.2.2.2.1.size_eq_zero.1 this.1
        cases sr.2.2.2.2.size_eq_zero.1 this.2
        obtain rfl : rrs = 1 := sr.2.2.1
        rw [if_neg, if_pos, rotateL, if_pos]; · rfl
        all_goals dsimp only [size]; decide
      · have : size rll = 0 ∧ size rlr = 0 := by
          have := balancedSz_zero.1 hr.1
          rwa [size, sr.2.1.1, Nat.succ_le_succ_iff, le_zero_iff, add_eq_zero_iff] at this
        cases sr.2.1.2.1.size_eq_zero.1 this.1
        cases sr.2.1.2.2.size_eq_zero.1 this.2
        obtain rfl : rls = 1 := sr.2.1.1
        rw [if_neg, if_pos, rotateL, if_neg]; · rfl
        all_goals dsimp only [size]; decide
      · symm; rw [zero_add, if_neg, if_pos, rotateL]
        · dsimp only [size_node]; split_ifs
          · simp [node3L, node']; abel
          · simp [node4L, node', sr.2.1.1]; abel
        · apply Nat.zero_lt_succ
        · exact not_le_of_gt (Nat.succ_lt_succ (add_pos sr.2.1.pos sr.2.2.pos))
  · cases' r with rs rl rx rr
    · rw [sl.eq_node'] at hl ⊢
      cases' ll with lls lll llx llr <;> cases' lr with lrs lrl lrx lrr <;>
        dsimp [balance, balance']
      · rfl
      · have : size lrl = 0 ∧ size lrr = 0 := by
          have := balancedSz_zero.1 hl.1.symm
          rwa [size, sl.2.2.1, Nat.succ_le_succ_iff, le_zero_iff, add_eq_zero_iff] at this
        cases sl.2.2.2.1.size_eq_zero.1 this.1
        cases sl.2.2.2.2.size_eq_zero.1 this.2
        obtain rfl : lrs = 1 := sl.2.2.1
        rw [if_neg, if_neg, if_pos, rotateR, if_neg]; · rfl
        all_goals dsimp only [size]; decide
      · have : size lll = 0 ∧ size llr = 0 := by
          have := balancedSz_zero.1 hl.1
          rwa [size, sl.2.1.1, Nat.succ_le_succ_iff, le_zero_iff, add_eq_zero_iff] at this
        cases sl.2.1.2.1.size_eq_zero.1 this.1
        cases sl.2.1.2.2.size_eq_zero.1 this.2
        obtain rfl : lls = 1 := sl.2.1.1
        rw [if_neg, if_neg, if_pos, rotateR, if_pos]; · rfl
        all_goals dsimp only [size]; decide
      · symm; rw [if_neg, if_neg, if_pos, rotateR]
        · dsimp only [size_node]; split_ifs
          · simp [node3R, node']; abel
          · simp [node4R, node', sl.2.2.1]; abel
        · apply Nat.zero_lt_succ
        · apply Nat.not_lt_zero
        · exact not_le_of_gt (Nat.succ_lt_succ (add_pos sl.2.1.pos sl.2.2.pos))
    · simp [balance, balance']
      symm; rw [if_neg]
      · split_ifs with h h_1
        · have rd : delta ≤ size rl + size rr := by
            have := lt_of_le_of_lt (Nat.mul_le_mul_left _ sl.pos) h
            rwa [sr.1, Nat.lt_succ_iff] at this
          cases' rl with rls rll rlx rlr
          · rw [size, zero_add] at rd
            exact absurd (le_trans rd (balancedSz_zero.1 hr.1.symm)) (by decide)
          cases' rr with rrs rrl rrx rrr
          · exact absurd (le_trans rd (balancedSz_zero.1 hr.1)) (by decide)
          dsimp [rotateL]; 

Proof state:
case pos.node.node
α : Type u_1
x : α
ls : ℕ
ll : Ordnode α
lx : α
lr : Ordnode α
hl : Balanced (node ls ll lx lr)
sl : Sized (node ls ll lx lr)
rs : ℕ
rx : α
h : delta * ls < rs
rls : ℕ
rll : Ordnode α
rlx : α
rlr : Ordnode α
rrs : ℕ
rrl : Ordnode α
rrx : α
rrr : Ordnode α
hr : Balanced (node rs (node rls rll rlx rlr) rx (node rrs rrl rrx rrr))
sr : Sized (node rs (node rls rll rlx rlr) rx (node rrs rrl rrx rrr))
rd : delta ≤ size (node rls rll rlx rlr) + size (node rrs rrl rrx rrr)
⊢ (if rls < ratio * rrs then node3L (node ls ll lx lr) x (node rls rll rlx rlr) rx (node rrs rrl rrx rrr)
    else node4L (node ls ll lx lr) x (node rls rll rlx rlr) rx (node rrs rrl rrx rrr)) =
    if rls < ratio * rrs then
      node (ls + rs + 1) (node (ls + rls + 1) (node ls ll lx lr) x (node rls rll rlx rlr)) rx (node rrs rrl rrx rrr)
    else
      node (ls + rs + 1) (node (ls + size rll + 1) (node ls ll lx lr) x rll) rlx
        (node (size rlr + rrs + 1) rlr rx (node rrs rrl rrx rrr))

Next tactic:
split_ifs