Usyk, Fury, Dubois, Joshua, Parker and Kabayel Usyk, Haye gets KO'd - Wouldn't handle Usyks work rate, or power and technical boxing. Fury - Fury's size and reach would probably see him win but if Haye landed big I could see Fury having to get off the canvas again. AJ - AJ size and reach and power play a part of but if AJ isn't throwing in combination then Haye's upper body movement and powerful counters give him a good chance. Haye hit harder than Ruiz. 60/40 AJ but Haye is very much in the fight. Parker - JP does a lot of things well. Good chin, nice hand speed. He's a very typical boxer and doesn't have the size that many other big heavys have. Could see Haye pot-shotting to a win here Kaybayel - might be the best of the non-big names. Adaptable, heavy-handed and brings the pressure. Still yet to have that big breakout fight and so on experience against big names i'd lean towards Haye but not by much.
I don't think Haye's career would be very different at all. His CW run might have had more struggle and I do not think he beats Usyk in either division. He could be the champ right before Usyk ... maybe. As far as HW, same exact ****. He'd get a title then lose the uni with the far better Ukrainian.
What we know is he probably had the power to KO most HWs since he KO'd Chisora pretty easily and Chisora is hard to stop. But we also know he isn't the toughest, and relied on speed to avoid taking too much damage. Usyk would beat him, probably late TKO. Fury would beat him, probably late TKO, but maybe points if Fury is really careful. Dubious probably beats him by KO, but might get done like Chisora. Haye probably beats current AJ, would beat him to the punch and KO him. Not sure about younger AJ, who is huge compared. But Ruiz did it via counterpunch, so Haye might. Haye might beat Parker, but Parker is an all rounder and if the fight goes later maybe he takes over. Haye probably beats Kabayel. Very confident he doesn't beat an experienced Fury or Usyk. But Fury under Hill possibly more reckless than the early Fury so you never know, could get KO'd.
Sub .500. Parkers the only one he should be favored to beat and Parkers got a better shot at beating him then Hayes got against the rest of this group. I think Haye is really underrated and does well in most of these fights btw hes just unlikely to actually win most of them.