Originally Posted by guilalah
Probably a combination of 1) Lyle perhaps being a little harder puncher, and 2) Lyle and Foreman mixing it at a distance congenial to both of them, while Frazier probably had to punch outside of his distance. Second factor probably the bigger one. (The more the hook opens up (past forearm perpendicular to upper arm), the less the fore-arm (with the fist at the end) corresponds to the vector of force).
As for the Ali KO, I think that a) the count was a little quick, and b) at that point a quick count was fine by Foreman. I'm not saying, though, that Foreman didn't try to get up in time. He got screwed slightly, but I don't think he much minded.
I thought this was close enough to the definitive answer