In the comics Bane figured out Bruce Wayne's identity on his own. Remember Bane isnt just a brute, he is actually one of the smartest Batman villains as well.
Like i said, the League of Shadows angle wasnt needed in the first place.
in the comics, BANE was suppose to be hispanic too and depended on the venom serum that gave him super strength...but this ISN'T the comics thou..
the LoS was needed MORE than the need of BANE. and i'm not saying that to dismiss BANE, but when u are talking storybook-wise, EVERYTHING IN TDKR ties up to BATMAN BEGINS!!! literally, everything!