IF cotto can beat mosley by more than a razor thin decison then i would consider him a real threat, if he is able to handle shanes speed and movment then i think he could have a chane at beating floyd, even if floyd blocks cottos punches i think they will still hurt him and over 12 rounds he might be able to do enough... i would favr mayweather heavily tho...

Paul williams is imo the most realistic threat to floyd, mayweather is gunna have to out-box him, and tbh with williams stupid reach and he as great speed i honestly can see him out pointing floyd... i don't think hes a better boxer, just a freak.