Man, the Big Boss double would be the worst possible way for this story to go. I can see it now:
It wasn't ACTUALLY Big Boss in Metal Gear, it was his double, the real heroic guy was off doing... things.
It wasn't ACTUALLY Big Boss in Solid Snake, it was a Snatcher, and that was the one training war orphans and turning them into killing machines. Regular Big Boss was living it up in Tahiti. Or no wait, his other double was in Tahiti, Big Boss was actually in cryo-sleep the whole time.
It wasn't ACTUALLY Big Boss in MGS 3, that was a nanomachine VR mission that Raiden undertook just before Sons of Liberty.
and of course:
It wasn't ACTUALLY Big Boss in MGS4. That was a hologram, and that wasn't Zero in the Wheelchair either. The REAL Big Boss and Zero are retired and living together in an apartment on the upper east side.
Even though I'm a huge fan of Hayter, and don't really like Kiefer in the role, I'm pretty sure and have accepted completely the fact that Hayter is not coming back. I don't think he will be in the game at all.
I believe the guy we are playing as during Ground Zeroes AND Phantom Pain is the REAL Big Boss. No doubles, no Hayter. In the end, I'm sure the explanation for this will be simpler than what fans believe.
That line of dialogue is very interesting, though....
Pretty much this. The whole point of watching Big Boss' descent into darkness would pretty much be pointless without actually PLAYING as Big Boss. And again, in order for the double theory in Ground Zeroes to make any sense at all you would have to have been playing as that double since at least Peace Walker.
Though I would suppose that might explain why in PW Big Boss was an idiot who worshiped Che Guevara and
believed in Santa Claus.