Floyd may have an unblemished record, but he's long been criticized for dodging some of the best contenders.
Whether or not he was able to defeat the many challengers who have stepped up to the plate is for another debate, but the fact that he never even attempted to face off against the toughest opponents speaks volumes about him.
Mayweather constantly uses the excuse that Fighter A lost to Fighter B years or months ago, and therefore has no chance against him. But what he does not realize—or is not willing to publicly admit—is that a fighter's style will make the fight.
Floyd is unbelievably gifted and is one of the best defensive fighters in the history of the sport. Fighting Manny would be a clear clash of styles. Manny is a southpaw pummeler and Floyd is a defensive shell. This is one of many reasons why it's such a compelling fight to put together.
Some of Floyd's staunchest defenders will say that he recently took a fight with Mosley—in which Floyd thoroughly defeated Shane—but this was a bout that should have happened years ago when Mosley was still in his prime.
Mayweather continues to spew the nonsense that he's the greatest fighter ever, which is an insult to the many greats who cut their teeth in the ring against the top fighters of their generation.
Floyd hides behind his perfect record, but any rational boxing fan can see that as long as he avoids the strongest challengers, his legacy will never hold up against the likes of Sugar Ray Robinson, Muhammad Ali and countless others.