Usyk has enough power to keep anyone honest at HW. He's not knocking people out with one punch but he has enough to stun them and the accuracy to catch them clean repeatedly, if they try and just walk him down. I think he could potentially embarrass Wilder and stop him(overrated chin). I don't think Fury fancies it either.
Even if Usyk loses against AJ, there is no shame in that. I'd still fancy his chances against the rest of the top 10 and would love to see it. Great fighter, likeable personality, will fight anyone, good for the division.
Equally, if Usyk wins, that puts him up there with anyone at HW. I'd still fancy AJ to beat anyone else in the top 10, with Fury the only question mark.