Strike while the irons hot, plus he needs to get out of the amateur habits before they get ingrained forever.

As for his chin, impossible to gauge how much of a punch he can physically take, but he doesn't seem to like to mix it up too much, seems quite common in succesful ameteurs as the hit and run tactic is rewarded in the scoring system. Audley wanted to be heavy champ without taking a punch, and I have an inkling Khan's philosyphy is quite similar and neither has overcome that aspect of their game.