Obviously I'm in the minority, but I think Khan could have survived. I thought Kenny Bayless could have let it go on. Knan's legs were gone because he lost his equilibrium. He could have gotten that back after another minute or 2.
For me, I don't think that Khan could have survived the KO. Why? Because, he was trying to fight back Gracia all the time while he was in that serious situation so he would have kissed the canvas again and again in later rounds if he had continued. Khan must have boxed him.