Re: "You have no evidence that Khan has a china chin..."
His problem is that in moments during the fight he left his chin in the air. It is definately something he can work on and he must work on if he ever hopes to fullfill the hopes he has. I am pretty sure though that if he gets hit again, that chin in the air or not, he will taste canvas. His handlers clearly know this is a weakness, hence the opposition he has faced has had very low KO %'s.
He did come back well from the knockdown and that should be applauded.