... Holmes was about the same age as '62 Liston when he fought Cooney. Liston mightn't be quite as great a pure boxer as Larry was, but would be a worse matchup for Conney because of his offensive tools.
Purely answering the question asked. Cooney gets taken out in a few rounds. How few? Not more than five.
Liston destroys him 8.5 times out of 10. Perhaps if Cooney had a different rise to the top, more toughness in the trenches and experience, these odds would be swayed, but on actual production, it aint even that close.
I would've favored Liston. Cooney did well against Foreman though. Still Liston was a champion so have to favor him even with Jerry's size and power.
As much as these guys are teasing you, Cooney actually did look fairly sharp in the first round of the Foreman fight, and for even a short part of the second round. For a man who had only fought some 3 times in 8 years, Cooney's jab, hook, and footwork looked pretty good against a much more actively fighting Foreman, who at this point had an improved defense. In my opinion, this fight gave us a slight glimpse of what Gerry might have become in his prime, had his career not been derailed.
Very few fighters really stood up to Liston.....Williams hit him his best shots and then got knocked out, Machen boxed him, Ali beat him, and Marty Marshall pulled the barking dog routine and made Liston laugh..then broke Sonny's jaw. If Cooney is not intimidated, and lands big on Liston, then he might go 8-9 rds before getting k.o.'ed. But if Gerry doesn't think he can win, ...well, Liston loves to knock those type of guys out quick.