His most dangerous fight is on march 13th... if he comes thru that without a loss & remains focused AND doesnt fight on too long, then yes, I think he will retire undefeated, I dont see any WW - Mosely included - having a better than 35% chance of beating him.
He will if he continues to avoid the toughest challenges after possibly beating Pac. Depends on what happens after March 13.
Floyd is arguably the best fighter of his era right now. If he beats Pac, that argument becomes a lot stronger. If he then goes and beats Mosley, he will unquestionably be the best of his era. Williams is a MW now, beating him is not neccesary. It would be great to see that fight regardless though.