Underrated Weak Chins?

[DOMMA]

There were double negatives used here, so maybe he's looking for greatest chins of all time?

 

[COBRA03]

Chuck Liddell: The later years
Luke Rockhold: KO'd by Bisping!
James Thompson: Meanest looking glass jaw ever
Alistar Overeem: a lot of KO losses, but all against big hitters