I recently saw the E3 trailer for BBS, and it made me think who the secret boss really is. It can't be Xemnas, because Xehanort hadn't lost his heart for a while after the events of BBS. But remember when he locked the heart (we don't know which one) at the end of BBS? Maybe that person had created a Nobody and a Heartless from THAT heart before Ansem SoD/Xemnas was even created. That's my theory, what do you guys think? ***I think the boss was the Nobody of Terra or MX, but most likely Terra***.

okay so its a paradox...that would be bad...well at the end of Re:coded it said that Xehanort (not MX but possessed Terra) was remade. Couldn't he be able to go back some how in time using whatever knoweledge he has to go and fight the past people in order to strengthen them, well Terra, so MX can have a stronger body?

 

Oh and the fight was canon from what Nomura said, and if it did happen that way MF would have only fought Aqua seeing as Terra was already possessed and Ven was already in a coma from what people say

I think MF is ansem the wise from the future using a time machine(im serous). He is a scientist after all he probably could make a time machine and we dont know if he can fight or not so it could be

Maby its just darkness