A very big posibility

[Mangenaka]

a true enigma is also black zetsu!! i do not believe the guy and i just have a hunch or a small theory that zetsu and tobi are this same person that we all know madara in some point of history came in contact with. my theory would be something like where the **** is black zetsu now?? only the white is appearing in the past mangas and i fear that a third person no sasuke from future or madara from past is tobi (or black zetsu), it is actualy quite afermative because tsunade and the people at the headquorters stated that, and as far as i know wrong or stupid statements made by characters are not kishis style. so who is black zetsu or toby, do not know. i leave that one to people who have time to go threw old mangas and find bits and pieces that could fit. but with this that i mentioned i just am trying to state a third person is here (tobi) and we canot know who he is bcs kishi covered that up but this black zetsu guy feels like a ghost/spirit type thing/man and the white one is a hashirama cells built maybe by madara thing/ man, and the guy known as toby is an uchiha vesel ( maybe obito) for fighting which black zetsu or who ever he is is using for this war. thank you and i apologise for making this text complicated. i hope that it will cover up some things that are true and it will give some one inspiration for even a better theory