I don't know what this best of all time stuff really means, but they are all great fighters. There just seems to be something a little off with Mayweather and his ducking of Manny though. You cannot avoid the other best fighter around your weight class and expect it to look good. Hopkins and Roy have losses, but they took on the best no questions asked. Floyd still has that big question mark and the Manny who beat up Cotto to a pulp wasn't fought and instead actively avoided.