Mayweather is easily top 15 PFP material imo. That said, I find it real difficult to imagine him beating Duran at his peak. The Duran who beat Leonard...Duran was in terms of savage determination nearly the equal of Tyson during that one fight, and I believe in the first Leonard fight he was one of the two or three best ever in that division. I do think a bout with Floyd pitted against the supernaturally-cool Sanchez would have been incredible! Gomez would have been bumming.