Excellent lists so far Mike Tyson had a damn good chin aswell. Slightly better than Holyfield. But he had bad recovery capabilities. + Once he gut hurt he tended to freeze and was the easiest target to hit. Ali & Holmes had it all: chin, fast and fully recovery, body shot resistance, effective surviving instincts and "emergency defense".
I don't agree with most of your posts but I like that you mentioned Liston who's always missing in threads like these, though his chin was magnificent and he absolutely deserves a mention. He was only undisputedly dropped once, very late in his career and likely in his 40s with a vicious combo. "Williams hit Liston with a left hook that would have finished any other man" Gross remembered. "It would have torn some fighters hears off. Liston just blinked and came right back." Source: https://www.newspapers.com/clip/54152307/fort-lauderdale-news/
Vitali does not belong in that list. his reputation of chin is only from 1 fight. he rarely got got hit with a power punch and even almost never flush.his chin is not proven enough to be ranked among the best of all times