I agree that all three stop Billy. That said, Tyson may very well get to him early, but if Billy can survive the early rounds he might be able to hang in there a while. Sometimes if a fight didn't end early for Tyson he would shift into a lower gear, as with the Bonecrusher Smith fight. But he was always dangerous and could turn it around with one good shot, like he almost did in the 8th round against Buster Douglas. Frazier's style is just bad for Billy - the speed, pressure, and power plus size would make it just a matter of time. Billy would probably last longer against Rocky as Marciano would have to get in close to do his damage. Billy might be able to put on a performance similar to Ezzard Charles but he would absorb a horrible amount of punishment along the way.
I think Conn looks best against Marciano for a little while, mostly because the size differential isn't as great as with the others, but Rocky wears him down and catches up to him. Billy just doesn't have enough pop, speed, or strength to faze pressure fighters like Frazier or Tyson. Put Billy in against light-heavies from any era, and I'd love to see the fight. Has anyone posited a fight between Billy and Roy Jones? I'd have to do some research before I make a definitive prediction, but as of now think Billy has enough heart and ability to defeat Jones.
This is a conundrum of a question. Logic says all that you knock him out quickly by enforcing their will. But then we know what he did to Louis for 12 rounds. I'll say Marciano has the same kind of issues Louis did and scores a late ko. I'll say Frazier and Tyson stop him early, within the first 6.
Since Frazier and Marciano are very similar, I have both stopping Conn late, probably being outboxed by Conn for a long time the way Louis did. He might outbox Tyson for 5 or 6 rounds before being tagged in the 7th or 8th and it would be the end for him.
Tyson would breeze thru Conn. His speed of foot, two handed power, handspeed, body punching and early aggressiveness make him a near perfect slayer of light heavyweights - early. Conn wouldn't be able to rely on tying him up either. Fantastic light heavyweight but he's on a hiding to nothing in this one.
Tyson was just so good at cutting the ring Will where as Louis was much more calm and measured about it. He often followed guys around (comparative to Tyson) and played the long game. If he hurt someone he would be all over them. Tyson really went looking for it.
The problem Conn and indeed any LHW will have with Tyson is that their advantages are already negated. They aren't going to be the quicker man in the ring. He destroyed the cagiest early rounds LHW in history. Destroyed.
Joe Frazier bobbed pretty much exclusively on defense. He had a great chin but the uppercut was usually there on him. Rocky had an underrated defense that included bobbing weaving and shoulder rolling up close. Offensively Rocky was a puncher with both hands, Joe was mostly left hook.
Talking of Conn, I believe he could be under the banner of a underrated fighter ! By the age of 23 he had fought and beat 9 yes 9 world champions C,mon thats pretty good stats by any ones standing, also he put the beats on the likes of , Oscar Rankins, Fred Apostoli, Solly Krieger, Tony Zale, Fritzie Zivic, Babe Risko, Vince Dundee, Teddy Yarosz, Young Corbett 111, Lee Savold, Melio Bettina, Gus Lesnevich. Bob Pastor, not withstanding had he chose to box rather than slug, he could have beaten Louis.
I believe in all of this except the final sentence. His record is outstanding and he fought with almost 0 amateur experience. So he picked up a few early losses honing his craft, but once he learned, he really got rolling. It's an excellent wins list. However he slugged often with Louis the myth that he boxed and then decided to slug and got caught is a myth. He was tired, he had to avoid a monster puncher for 12 rounds, but he didn't alter his game plan. He also didn't quite have the fight in the bag. He was up on two cards by 2pts i believe and even on a 3rd after 12. Had Louis swept 13,14,15 i believe he could of pulled it out but I might be wrong on that.