I don't think the Quiet theory is true because it all started as a joke and it would be a tremendous stretch. I mean not that Kojima hasn't already gone further than this with Liquid in Ocelot's arm, but I still don't think so.
The strange thing about it is that it really gets me thinking though, like $200 says Ground Zeroes spent so much time shaping Chico's character that I don't think it would be a stretch to call Chico the deuteragonist of the game... I would have said that was Kaz Miller before and Chico is just collateral, but after his potential survival and all those audio tapes I'm just not sure anymore. Way too much focus on him in the prologue, I think.
I mean Chico got up close and personal with Skull Face and suffered the most trauma and has the most reason out of the cast to get revenge on the antagonist, Chico's name in itself means "Boy" in Spanish which lends itself to the question what is he going to become when he's an adult after the 9 year time gap? I don't believe he didn't survive for a moment, they purposely left the accident and who survived ambiguous outside of Paz's death, and it would be too much of a missed opportunity to not see a Chico in TPP who has lived through that trauma. It's a far crueler fate than having them both die IMO.
We haven't seen him in any of the Phantom Pain segments of the trailers so whatever we find has become of him, I have a feeling it's going to be a big surprise. When it comes to Quiet going back to my claim that Chico seems like a suitable candidate for Deuteragonist, we know that Kojima called Quiet the "heroine" of the game which again is quite a statement for a new character that as far as we are to believe has nothing to do with the epicenter of the revenge subplot which was the Ground Zeroes Incident. I imagine we'll be recruiting and there'll be lots of other subplots at play with people from different war backgrounds, but I can still understand some of the logic and evidence that lead to people taking it from a joke to something real.
I think it might be more a case of Big Boss is in the Snake role, Quiet is in the Meryl/Eva role, and maybe Chico will be a wildcard or Gray Fox type character who has a score to settle rather than Big Boss's sidekick. Speaking of Gray Fox, I really hope we see him in the new trailer
