As I had previously posted, Yank Durham did not want an undefeated Joe Frazier anywhere near a peak Muhammad Ali in 1967, he must have figured that Ali would soon be imprisoned because of his unwillingness to be inducted into the military, soon to be imprisoned for that Federal offense. In my opinion, Ali would have defeated Frazier, by points. That version and even the version afterward did not have the punch of a George Foreman to do stop a Joe Frazier. But if they had met after Frazier was more seasoned, let's say 1971, I say Joe takes him on points like in their epic battle on March 8 1971. As for Norton, Ali beats Ken on points without a doubt, again Ali could not punch like Foreman.
IMO Ali played it safe by not going for the KO, perhaps he was afraid of making a mistake and getting countered and staggered.
That White Bomber I agree with, anyone including Muhammad Ali stands a chance of getting knocked out, playing it safe is always good.