Beating up a washed up Hollywood resident who hadn't competed in years in a ten rounder in the rain? Meh.
It's interesting, the big heavy wins. Frazier over Ali is compromised by Ali's inactivity. Rahman over Lewis is compromised by Lewis's prep. McCall over Lewis is compromised by pre-Steward plus the stoppage. Schmeling's win over Louis is compromised by Louis's attitude to the fight. Spinks's win over Holmes is compromised by the controversy surrounding the decision and his age. Foreman's win over Frazier is compromised around the damage done to Frazier and his illness in FOTC. The list goes on and on. There's a shortage of very clean big wins. Maybe it really is Foreman's ye olde man win.
No match-up is perfectly balanced and clean. But the fighters sign on the line that is dotted, knowing what they are getting into. One assumes they most often do so with the idea of winning. That said, I have long thought the Ali inactivity trope is overplayed. He had stopped a very good Quarry not long after Quarry took Mac Foster's O, and then provided Bonavena with the only stoppage defeat in a 68 fight career. He wasn't even 30 years old, a pup by today's heavyweight standards.
Some of those 'comprisings' seem a bit trite. If we buy these as compromises, then there has probably never been a 'clean' win in the history of heavyweight boxing.
It's mind-boggling enough to read as a fairy tale, really. At any rate Foreman's decimation of Frazier is certainly top 5, ever. How deep you go into the five is personal preference.