STFUandPLAY's Romudeth writes:
"As to whom we’re seeing on screen; I have a theory. I was talking to a friend and he’s convinced me that this character is non-other than Liquid Snake.
The theory that this new character is Liquid could be dismissed because the arm he’s missing is his left one and not the right. However, we have to keep in mind that “an arm” was recovered. It was never specified as to which one."
Is The Phantom Pain Really Metal Gear Solid 5? Is That Liquid Snake?