Rate the top Heavyweights chins

Who in this group has really been tested- I feel like these guys are top heavyweight NECKS. The examples here make a career out of minimizing their opponents offensive head strikes by exploiting -reach/lean advantages, head "tosses", and bull rushing.
That being said- I feel as though for the most part, when they do get caught they are all pretty solid and its hard to make a case that any 1 is marginally better than the next.

I was always impressed with James Toney's chin. Even though he was a wily-inside fighter and rolled a lot of punches away or made people miss in the pocket- when he got caught FLUSH even by some bombs, he seemed to shrug them off mostly (Also no doubt why he is a little more slurry-of-speech than some fighters)

 

HW fighters' chins are harder to judge than chins of fighters of a lower weight class, because just about everyone at HW can punch. If you get hit by a 200+ lb guy, you're gonna feel it.

 

Of this group: Povetkin has been tested the most. He is proven.