Gray Fox might be Big Boss in MGSV and the real Big Boss might be in coma after Ground Zeroes.

Keifer voices Gray Fox as Big Boss and David Hayter will voice the real Big Boss.

This is just a theory, watch the video.

http://youtu.be/tb1WhDdto08

No No.. rumor states Solidus is posing as fake big boss. It make's more sense for that is the reason Solidus is created to begin with.

A fake Big Boss would explain why the fuck is he missing an arm.

The Big Boss that's missing an arm is the real boss. He most likely lost it in the attack on Mother Base. While Big Boss is in a coma somebody is posing as him. Theories state it may be Solidus.

I was hoping that wasn't true. That is a mistake. Big Boss didn't lose an arm. Not even the Metal Gear Encyclopedia acknowledges that.

I wonder... If Big Boss lost an arm. Why is it that in MGS 4 he appears with both of the arms?

Anfebious said:
I wonder... If Big Boss lost an arm. Why is it that in MGS 4 he appears with both of the arms?

Big boss body was rebuilt with pieces of Liquid and Solidus in MGS4

While that actually could be possible too, just look at the video! It's gotta be Gray Fox!

Oh it's true... I forgot about that xD. The story is so complicated at times Dx.

Wasn't he like... rebuilt at the end of MGS4?  That's why Solidus was that disgusting half-corpse, because they'd used his body parts?

Something like that.  S'been a while since I've played the game.

edit: Beaten :(