Tyson might ultimately lose to Sonny Liston, and to Joe Louis, but I think he is being sold short here. He was far faster than both and had little trouble coping with jabs until the Buster Douglas fight, on a night so many on this site feel he came in unprepared. Louis was a guy who could be kayoed, as was done by Schmeling, and Tyson could knock opponents senseless and did so, consistently.
This notion of Tyson standing back with two feet together: true, but this was apprised by many of his opponents in advance -- and it didn't help them. Just one KO victim after another from 1985-1989. Tyson rarely lost A ROUND at that time.
Tyson inside was a lazy, holding fighter, I'd say, but . . . he proved against the strong Berbick that he can get it done inside. Like permanently.
Separately, JLP 6, I think Ali beats Louis fairly easily, just based on speed and movement--style overall. Liston? Don't know how he fares with Louis, but Louis was a far more proven commodity than Liston. And heck, I'm a Liston fan saying that.
I'll take Marciano over Liston, whether Liston has a pole-axe jab, a hard right, a fine chin, whatever. He wasn't the man Marciano was when it came to taking it, and take it he would with Rocky.