These are the top ten undefeated heavyweights as ranked by BoxRec: Oleksandr Usyk Agit Kabayel Artem Suslenkov Nelson Hysa Bakhodir Jalolov Gurgen Hovhannisyan Labinot Xhoxhaj Vartan Arutyunyan Umut Camkiran Teremoana Teremoana Usyk should retire undefeated. Kabayel if he fights Hrgovic might lose, but may fight someone else and then remain inactive for another year. Suslenkov and Arutyunyan are talented but too small to defeat some of the better large heavyweights. Age will defeat Hysa sooner or later, or if he fights Kabayel. Jalolov will likely remain inactive until they age him out, so still should be undefeated in a year or so. I expect Teremoana to continue to fight soft opposition for at least another year. Camkiran will be an "opponent" for a top heavyweight sooner of later, as will Xhoxhaj, and each will receive his first loss. Hovhannisyan seems strong and durable. He would probably lose against the top heavyweights but may not be able to get a fight with one of them.
I got Usyk, Teremoana and Jalalov. I think Kabayel will get beaten quite soon obviously depends on the opponent. Suslenkov doesn't appear special so if he steps up he could lose. I don't really know the others.
Yes, I think Kabayel would lose to several top heavyweights such as Hrgovic, he didn't look good against Kynba and was gifted an early stoppage by the referee. I like Suslenkov, he's a very good fighter. But he's too small at 6'1" (2" shorter and has shorter arms than Usyk) for the modern heavyweight division. He should be fighting at cruiserweight.
There's a high chance they all have it. Maybe 1 or 2 go down. Usyks only fighting 40 somethings from this point on. He's not going to lose.
True. With an honest referee, Dubois would have been disqualified for his multiple illegal head butts. Usyk will very soon be 40-something himself. Yes, he'll easily beat anybody his own age.