I was going to put Mancini on that list,but in all honest,he only had 1 loss before the Kim,to Arguello(no sin there) and he was never the same after that fight.
Even though he did hold on to the title for 2 more defenses
I cant really penalise the guy,who knows how anyone would react to that abortion of a fight,and the backlash that followed
But another one to add Buddy McGirt,2 times champion who unfortunatly fought in the era of Sweet Pea