Nobody out machos AB at 80kg, I'm fairly sure his power would also translate at CW and HW. Usyk survived vs beterbiev with head gear and 12 oz gloves, still got dropped. I'm not saying he can't be hurt on the inside but I don't care whoever you put him in there with one thing is clear, AB is the puncher in the fight - he's the KO artist
Kovalev could have a shoot out and KO him if he landed his artillery first, and likely could since he had more reach and was possibly faster. People assume Beter is tougher but is it really the case. He's taken a few of the better punchers he's faced out (Smith and Smith) without taking their best shots first, which makes him look good but doesn't prove he can handle huge power any better. Kovalev could take some shots back in the old days, he also took a lot of shots from Yarde without getting stopped. Even if Beter is tougher it's not by that much and Kov had the kind of power where it probably doesn't make much of a difference. I doubt Beter can shrug it off. Kov devasted iron-chin Cleverly who'd been in with Bellew already and was hard to stop. Cleverly couldn't believe the power. People have a vision of Beter pressing forward, bouncing Kov's shots off and clubbing Kov to death. I think if he tries that there's a good chance he gets nailed by RH's and put on the floor in shock, then struggles to recover. Now, if Kovalev can't land clean, can't hold him off and gets caught bad, sure he's in trouble.
Qawi for sure, i'd give Spinks and Matthew Saad Muhammad a shout as well, although I'd probably favour Beterbiev