Probably a silly question but its been bothering me so i want to know what you think.  Would you consider the player of this game to be playing Zach or Agent York?  You are pretty much directly controlling Agent York which is a strong argument for that case but York sometimes stops and asks you questions, implying you are Zach and you are just influencing the decisions he makes.  My mind.....

It would be way too obvious if Zach would be just the player. There's gotta be more to it.

Both?

I think you are playing as Zach whilst he controls (or guides) York.

" I think you are playing as Zach whilst he controls (or guides) York. "

It is a mystery~

Your zach who is in york's head.

I guess it depends on what you mean by playing. Technically you are "playing" York, but you are Zach. Something tells me this is going to factor into the game somehow later on.

I dunno, check out the Zach page on this here site.  You'll be spoiled.

The ending explains all that.  Like rjayb89 said, the Zach page gives it away so don't read it if you don't wanna know; the York page is safe, though.