Most overdone it saying he has a glass jaw. It still isn't all that great. The shot he went down with against prescott would have probably had a similar effect on most. To add he's gone up in weifght added extra muscle to the legs which gives him a better base. I wouldn't get too caried away with his chin he still has flaws and it could still be his undoing if he doesn't fix those.
khan showed a lot, maidana landed flush with his bombs, i thought before the fight that if he did, khan would be gone, with half a punch, but it wasnt to be so
When Khan was hurt in the 10th, he didn't try to land any of his bombs. He was either trying to get away from Maidana, or was trying to hold, but he doesn't seem to know how to clinch.
regardless of his chin, he took the biggest puncher of his divisions best shots and didnt go down.... what more could he do? stand with his guard down and chin out for 12 rounds to prove people wrong? nate campbell tried that once...
He's not dehydrating as much, and can take a better shot now. He's still chinny, just not nearly as bad as he was at 135.