Georges St. Pierre has spent more time in the octagon than just about anyone - only Frankie Edgar has more than him, in fact, just recently having passed GSP for the record. In title fights, GSP is still at the top of the heap as far as time spent in the cage. All that adds up to a lot of time taking damage. A couple of years ago, St. Pierre discussed "missing time" or "losing time" with Joe Rogan, something that caused a fair amount of concern for the champion. That's a possible sign of brain trauma - and a good reason why St. Pierre should stick to acting, coaching, and other projects these days.