Ali beats all of them and VS Holmes , its a 40 / 60 Fight in Favor of Ali. Fury is fast for his size but Prime Holmes would defeat Fury too. Many forget how good Holmes was. There is not much difference in size between Fury and Cooney - except Fury is the better Boxer and Cooney has by far the harder Punch. I don't see any problems with Ali defeating Fury either. So its Prime Ali vs Prime Holmes and there i lean slightly on Ali's side.
Agree about Braddock and Conn, not so sure about the other two. I'm willing to bet he ain't KO'ing Spinks, who was very awkward and not that easy to hit.