MAAAAAAAAAAAAAAAN If the OG Lex rolled up in the prison being the calm, charismatic Lex we all know from the animated series the theatre would have erupted Braniac or not.It could have been an easy too if they just said Lex Sr. *died* during the attack on Metropolis.
If this movie could have added any post credit sequence.
It would have been Cranston playing Lex visiting Lex Jr. in prison. We really find out its Braniac that merged with him.
It would match the fukkery that was in this movie
The only hard part is explaining where he been and what's he been up to this whole time