At close to 190lbs, Beterbiev was heavier in the ring during fights contested at LHW than the others, but outside of LHW, Spinks weighed as high as 212lbs, Patterson and Charles close to 200lbs, whilst Moore and Foster both weighed around 190lbs in non title fights inbetween defending their LHW title. I don't think Beterbiev is substantially naturally bigger than any of the above and were they competing at LHW today, they too would be c.190lbs on fight night. We know they could all carry it well and so why would they deny themselves that advantage? Well, technically, that (roughly) parity.
I believe everybody on this list gets folded like a lawn-chair, so let's call it a narrow difference of opinion.
I'd say Beterbiev goes 3-6 , he could beat Maxim, Saad and maybe Roy if he catches him.. The rest ain't losing to a guy past 35 with 20 fights, the water is waaay to deep,,,,
lol, he does train like a psycho tbf. He does way too much explosive weight lifting but also seems to be a magnet for weird diseases. Someday he'll end up postponing a fight because he has scurvy or trench foot.
Qawi was a tough SOB but walking forward and being a couple inches away from dwarfism isn't a great recipe against Beterbiev. I struggle to see how he could pull off the win. Patterson got bulldozed twice by a fighter pretty similar to Beterbiev in Liston, he's another Biev KO victim. And Bob Foster was beaten by anybody his size or bigger. He got battered by Frazier and Beterbiev has more dimensions than Frazier. The only guys I see giving Beterbiev problems are Moore, Charles, and Spinks. I lean Beterbiev for the first two because of their Marciano fights (that and the fact Moore had surgery to remove stomach ulcers and Beterbiev is a vicious body puncher). Spinks is 50/50 prime for prime though imo.