okay, here's my hunch...the old guy isn't big boss right, but it is a descendant of his from MGS, MGS 2, and MGS 4...now that screams to me LIQUID SNAKE!!!! here's my idea, after MGS, the patriots take liquids arm, and give it to Ocelot to see if he can take over liquids mind through the arm because of him being The Sorrow's son and all, but are in fact disappointed when Ocelot cannot, but they revive liquid somehow anyways just for some reason im not sure...but yea then they try to take out "Liquid" Ocelot after ocelot already gets rid of the arm in mgs 4...and then all that stuff happens in the conclusion...but yea i think its liquid cuz he was significantly younger than solid snake, so maybe he didn't age as fast? and maybe there is a really really deep secret to all this...I mean throughout the series, we've played as each snake but liquid and solidus...solidus was old and only made to be a complete replica of big boss and to be prez for a short time...liquid on the other hand was involved either directly or indirectly in all the games with solid snake...so i think this is his chance, and honestly, i'm juiced cuz he had all the dominant genes from the start! feel me?