Re: In hindsight what changes would you do
I tend to believe bane when he says he was born in darkness and didn't see the light until he was a man. He'd have no reason to lie to Bruce about that.
I think the film leaves the possibility of his comic origin completely open (him serving out the sentence of his father). Obviously it never confirms anything of the sort, but it's left open to interpretation. That's how I like to interpret it. That way, he sees Talia who is also born in the pit and cherishes her innocence because he sees himself in her and relates to her circumstances. I think growing up in the prison did harden him and did strip him of his innocence rather quickly, so it's feasible that he could see the child as a source of salvation or redemption.