After reading through the translation of the Chinese (If there was raws of Japanese, we'd know for sure) I guess the leader is Pein.
im tellin you i think this 'madara uchiha' is the BH. now before you tell me off hear me out, i read this really awsome theory in which it said madara married a hyuuga girl and he used her as a body container (much like oro used sasuke for...or well at least tried to) and the hyuuga woman was the BH so madara is inside the BH. and i think it sounds kinda cool so im goin with it XDDD
its like a fan fic documentary, kishi only mentions madara once i think,
...yep i agreed, tobi is still alive...somehow, cos he havent show his appearance yet...