Rampage might have the best, Wandy had to almost break his knee through Rampages face before he stopped him.
I wouldn't call sylvia having a glass chin. Sure he has been knockdown couple of times but got up. He seems to recover quick with his KD against arlovski and couture. Ray Mercer is a heavyweight boxer and sylvia is a dumbazz for trying to strike with him.
AA did take a few decent shots and I don't think he has a glass jaw I do think it is slightly suspect. GSP wasn't hit flush it was a grazing shot to the top of the head, then he took a bunch of shots until he tapped due to the strikes. GSP actually never got sparked out cold. I agree with your accessment of Chuck. Chuck DID get caught with some perfect shots right on the button so his you can't say are a weakchin problem, his are reflexes. Now Slice, I have to say that he DOES have a glass chin. That shot that sparked him into oblivion was about as hard as my 5 year old hits. I never want to see that twat step in the ring again unless he is fighting a crackhead or a homeless woman.
Leben can take one hell of a hit. Mark Hunt but not now as well. Arlovski, I liked the Goulet example. AND, Alessio Sakara.