Duran wasnt a murderous puncher at 154. He gives Kirkland a horrible beating and stops him within 4-5, but probably not 1. It would be a one sided slaughter though. Theres a better chance of Leonard stopping Kirkland in 1. In fact I think he would.
Frazier has a better chin than either, and no one would have complained if that was stopped in 1. I'd say Tyson could stop plenty guys in 1, these 3 included.
Good picks, but I see Dempsey beeing on the move for 2-3 rounds before George gets pissed off and rushing in. Getting dropped from single LHW-CW blows isn´t exactly the "durability trademark" I´d like to see facing GF. Or maybe an argument for a round 2 jojo? Thinking about that, I wouldn´t be surprised if Tyson or Foreman stopped him starting with a body shot
I don't think that there is any evidence to support the idea that Frazier had a better chin than these two. Even if he did, a first round knockout is always a bit of an aberration. Frazier condition contributed the the rapid demolition. Who is the best fighter that Tyson actually stopped in the first round? First round knockouts are a thing that happen in fantasy fights. In the real world they are few, far between, and unexpected!
I agree with you on Dempsey. But Marciano had an inferior chin, wasn't as well rounded, slower, and easier to hit than Dempsey. I can't think of one advantage Marciano has in a H2H sense. So I see The Rock going out in the 1st.
Bob Fitzsimmons vs Floyd Patterson - it would be short and deadly shootout, either man could stop the other quickly. I'd bet on Fitzsimmons, but Floyd could do the same.