He hasn't beaten anyone remotely great but definitely remotely good. I see a good scrap here, for sure.
He gave Usyk two tough fights at HW in the ams. He hurt Usyk with a kidney shot in the second that very likely would have counted in the pros but was deemed illegal when they fought. Beterbiev seems to be another that's destined to go out without a resume that seemingly matches his ability but I don't see anyone under 200 lbs having an easy time with him. I think he could make it tricky for a good number of very, very good fighters over 200 as well.
This is an often overlooked aspect of knockdowns. Often it's more about accuracy, hitting the guy with something they don't see coming, and/or the opponent being off balanced. One of my favorite knockdowns is actually Tyson's fight with Tillis. The way Tyson set it up was simply brilliant. Tillis got caught off balance and if you slow it down, you can actually see Tyson looking at Tillis legs and realizing its the perfect opportunity to get a down and swing the scorecard in his favor in an otherwise very close match. It was a combination of brains, awareness, and professionalism that few people talk about since they often only focus on Tyson's raw power. As you pointed out, you don't need a whole lot of that if you have good timing and accuracy. As for the thread, Rocky KOs Beterbiev within 5-6 in a very exciting and brutal phone booth brawl. I have Rocky top 5 h2h for anyone under 190.
Sure. I don't care for semantics. My point is is that the only reason this fight would be an amateur fight is for someone who couldn't bare to choose Marciano and will bend anything they can just to not have to. Then again, you know that, hence why you resort to semantics.
I don't think Beterbiev is in his prime anymore so not sure beating Bivol is necessary or realistic at this stage.