Teddy's real diagnosis (my opinion)

Rating: 10/10 (8 May 2020)

As far as Teddy's diagnosis, it's not Delusional D/O, but rather a complex form of PTSD that has associated Psychosis, which includes delusions and also dissociation. Of course this is all brought upon by the trauma Teddy experienced during the war and then his wife killing their 3 children. I would also add MDD and ETOH use D/O, severe, in remission due to his current hospitalization not allowing patients to drink alcohol.
As far as the ending, Teddy demonstrated partial insight as he realized the treatment that was awaiting him.