Frazier vs Foreman 2

Frazier was documentably also a '70's fighter-around his absolute prime in '70 & '71.
Though yes he was on the way down. Both in terms of his taxing style, but also he was increasingly lax in focus & training.
It is unlikely that a prime ATG gets blown out by another. But due to styles & size advantages, it can happen.

Like most all I still think Foreman KO's him in their respective primes.
Though it is fair to say-at least with a referre that did not allow the illegal pushing-Frazier would have a much better chance.