I am a Quarry fan and I agree with your Frazier assessment 100%. Frazier was simply in a different class.
That's a (young) Frazier's fault. Do you dispute that Ali was out of the ring for 3 1/2 years while Joe was plying his trade with multiple tough opponents during the March 67-October 70 Ali layoff? 3 rounds against Quarry, a full-length (almost) scrap with Oscar? 90 days later the FOTC. I repeat, if Ali had waited until the summer of 71 to fight Joe, he would have won IMHO.