I don't support it at all. Even if we take fighters only at their peak. I believe that if we match, say, top-20 HWs of all time against each other at their peak, the best of the best, no one would have less than 3 losses. There are few reasons for that 1) Styles. If we take Ali who is considered by many as the best h2h HW of all time, he had his stylistic nightmare Ken Norton which he couldn't beat convincingly at least once in 3 fights. Every fighter has wrong styles to deal with. 2) Neither fighter in history isn't 'head and shoulders' above all the others. Every fighter has his flaws which would definitely be exposed if he's matched against the best in history, even if he's one of them. 3) Fighters DO make mistakes even at their peak. Even the best fighter at his peak can make wrong decisions in the fight, or just get careless, and pay for it. Therefore I have no doubts that any given ATG fighter would've had his fair share of losses if he was matched in the line against the best in history, no matter how 'peak', how strong, how talented he is.
