he reached the absolute best he was ever going to. he's limited but fun. he's got nowhere to go but WAY down. he can beat the malignaggi's of the world (maybe) but most elite fighters will be able to embarass him if he isn't back to his old form. I don't see how he can anywhere NEAR his best but here's hoping...
Khan is beatable, we saw that against Garcia and Peterson, but I don't think putting Ricky Hatton up against speed in his first fight in years would be a very good idea. A rematch against Malignaggi is Hatton's best chance of a successful comeback. Malignaggi holds a welterweight title, has no punching power and was already dominated by Hatton.