MGS:PO retconned Grey Fox with "Awesome Ninja Skills" pre MGS.

Also, all hail Slowbeef for all your MG2 needs. If you don't have subsistance or an MSX, or don't want to sit through the game.

http://www.slowbeef.com/MG2/

He also did a pretty awesome walkthrough of Snatcher on Something Awful, one of the games Kojima made inbetween MG and MGS, but it was more of a forum thing, and would thus require lots of trudging through unnecessary posts.
And I no longer have the link.