"USKY will not be able to live with fury’s size and strength nor Wilders touch of death. Too cruiser too fragile." Those are the two most dangerous fights for him in my estimation as well. But Usyk has shown a great chin (never recorded as getting knocked down by a headshot in his extensive amateur and pro career) and Wilder is not a prolific body puncher (I can't remember him ever scoring a bodyshot KD let alone KO; he landed a nice one on Washington but it didn't have great effect). Most of Chisora's success was to the body, which is an easier target to hit than Usyk's head, especially hit clean.
I would too. However every fighter you listed is early to late 30s. At the rate these guys are fighting and how careful* they're matched, it's doubtful DD faces 1-2 of them. * At this stage DD is a low reward, but still semi risky opponent based on his punching power. From your list I can't even name one HW that might fight DD soon. For example, what about Ruiz? It's possible, but unlikely. Before the end of 2024/ early 2025, in what probable scenario does Ruiz fight DD?
Joshua and Chisora didn't go into the ring intending to strike low blows in the hopes they'd get away with some... It's easier to hurt a guy when you hit him where he's not expecting to have to defend and where it hurts - it's easy to hurt people with low blows, just as it's easy to do real damage with rabbit punches... Just because you can hurt someone more with an illegal blow than others can with a legal one doesn't mean there's more power on it. I disagree that Dubois has elite power - he has heavy hands, but if he had elite power then Joyce wouldn't have been able to just eat his biggest hits... As good as Joyce's chin is, Zhang busted the myth that he can't be wobbled. Whether Usyk can live with Fury or Wilder is yet to be seen, there are strong arguments both ways - Wilder has a punchers chance, and clearly hits hard (though how hard is questionable given the calibre of most of his opponents) and with how clearly he telegraphs his power punches it seems unlikely he'd be able to unload anywhere near full power on Usyk... As for Fury, it depends what condition he turns up in, if he can be bothered to turn up at all.
I'd say Dubois' power is definitely overrated too. Like you said, he has been crushing cans. Then Zhang proved Joyce's chin wasn't titanium after all. Dubois is a lesser Wilder.
Dubois gave it the big 'un in the build up, then fought like a timid puppy, got in one low blow, quit and moaned about it afterwards. I don't praise any aspect of his performance.