Whilst any answers to these questions are highly subjective at best, if not impossible to be certain, I suspect that overall, Cleveland Williams had better punch power than Ingo, possibly Nino Valdes too, even if he was coming to the end by the time Sonny got to him.
I suppose Mike DeJohn, then Patterson or vice versa. Maybe Ali comes after or before Floyd. It's true that not many of Liston's opponents were known for their knockout power.
Surprisingly Liston ranked Dejohn as the second hardest puncher he'd fought after Williams. I was a tad surprised; certain he'd say Valdez.