If he loses I think that it would finish him as a fighter mentally in not too dis-similar fashion to Prince Naseem Hamed.
Maybe PBF hasnt faced anyone as good as Winky, Cotto or Forrest but he forgot to mention that they all beat shane when they met. All 3 of them are boxers (Cotto a boxer puncher but he boxed well that night) and Shane struggled. Floyd is the best boxer in the business.
They also forget that Floyd would have lost to two of those three too. Mosley didn't do too badly in the rematches, but he was just over-matched in terms of styles. Against Cotto, Mosley misjudged the Puerto Rican's abilities, thinking he'd be the slugger he saw against Judah and Quintana. Jack Mosley was next to useless strategically, but when Mosley figured it out, he had Cotto on the run. Plus, Cotto was a different fighter back then, and his confidence was sky high.
i didnt say mayweather i said differant styles , floyd is what he is but he still makes shan look ordinary may 1st floyd shows all the bravery he needs to to get the job done and thats win