Floyd is the greatest of this era no doubt but I don't think he could run through a gauntlet of Leonard Duran and Hearns without losing that 0 and while being undefeated isn't the criteria for being the best ever he didn't have to fight fighters like this and avoided cats with styles that would have given him a little trouble like Paul Williams and Margarito. Now while he probably would have beaten those cats it would have made his resume look that much better in people's eyes. Him not always fighting the best comp will and should be held against him and that is one reason why he isn't the best ever. Plus there was a man named Walker Smith aka Sugar Ray Robinson who used to fight back n the day too.