Having height and reach on Zora, Harold and Eddie, I think he out jabs, out speeds and outmaneuvers them for the UD during the latter portion of this time frame. Cleveland would be a more interesting case, because of his size, hand speed and hook, and he could very well execute a knockdown with that fast and powerful left. Movement and straight punching would garner the younger man the decision though.
as he only had his first professional fight on 29 oct 1960 when he was 18 i think he was too young and inexperienced in 1961 to face those guys but after the archie moore victory in 1962 he would triumph.
It's hard to say, given the problems he had in the Jones fight he may have had even more problems with some of these, or that fight may have been an aberration
I see him winning all four, Ali was something special even then. I do think they would be points winns by a clear margin rather than knockouts.
Clay was very vulnerable to the left hook...even worse then. Williams would TKO him with Angie stopping the fight to avoid risk of ruining the "Big Fight" coming up in the future.
As I inferred yesterday, I could get on board with this. Big Cat had substantial experience by this stage, would have been a match in height and reach, and circa 1961-1963 may have been the fastest opponent Clay/Ali would have taken on in the 1960s after Patterson. Clay's punch resistance took a quantum leap from 1963 to 1964, while Cleveland, prior to his shooting, may have been a highly demanding opponent for any version of the GOAT.