Nope, there aint nothing wrong with his chin, the problem was he went in with a torn ACL ligament, however his camp convinced themselves it was somthing minor.. rushing forward too suddenly at the end of the round caused It to completely rupture. He does have the right style to beat Vitali, which is always been from the inside-out rather than outside-in.. An he can fight backing up, which means he can goad Vitali away from the centre of the ring, to the ropes where Klitschko's height gets neutralised..
What you think he has a glass jaw? I can't remember him getting hurt in the amateurs, including against some Huge hitters.