Witter is still in his prime, although he lost motivation for his last loss. He would absolutely destroy Khan in any way shape or form, and I would lay down hard cash if this ever happened, because Khan has no chin and movement and Witter would literally pick his pockets like a man picking the pockets of a 13 year old boy.
I don't know, Khan beating Witter isint exactly impossable the way I see it as long as he doesnt get careless and over expose his chin he has a good chance for a UD/SD.