I am actually not too sure... I can't even make my own top 10 list.. I pretty much just look at a fighter's career, wins, losses, ability, opponents fought ect, and decide if i think they were really good or "all time great" Judging ATG is for sure not an exact science.. I start to argue with myself over the top 3 fighters, so I realize what people think is great is certainly subjective... But I have seen lists that I wouldn't strongly argue with, and I generally think ATG would be falling somewhere in the top 100... I wouldn't argue with Joe being top 100