GSP is up there, but Fedor takes the cake, followed by others like Dan Henderson, Randy Couture, ect. Yes GSP is all around great, but heres something to think about. Matt Hughes' wrestling/strength is stronger in that category then any one piece of GSP's game. Picture a heavyweight who has freakishly good striking, submissions, strength, reflexes, ect that are better than anyone elses in his weight class: you have fedor. There are welterweights who are better at some aspects of mma then GSP, and that is why he isnt as strong a fighter for his class as fedor is. When fighting crocop his striking was better, nogeira his submission defense the best out there, ect. When st.pierre fights matt hughes, i still beleive hughes is the stronger man, but when fedor fights anyone, hes got every advantage over his opponent.