All of them except Fury, but Wilder was awful v Fury, Usyk would have boxed his ears off on that form.
I mean, he landed on Tyson Fury who people are calling the best HW of all time with the GOAT defense and chin. Anybody who he lands that shot on who doesn't outweigh him by 30lbs+ is probably toast bar like George Foreman maybe. But George would give him so many opportunities. I do have a theory a smaller opponent would be tough for him to find though. Like maybe this era of giants were slow enough to allow him to line it up more easily.
Wilder can still beat anyone with a bingo punch. loses to fury 9/10 Loses to aj 9/10 Everyone else is fair game for the next year or two, unless fury has ruined him/put the official blueprint out
He COULD beat any of them with his power. Let's not forget, he was a couple of seconds from knocking out Fury in the first fight. He certainly has the power to do likewise to the next best fighter in the division, which is Joshua (who also has easily enough power to KO him). In terms of likelihood, he's not beating Fury on the form of their second fight. I also think Usyk is a stylistic nightmare for Wilder. Him and Joshua is 50/50, whoever lands first. Probably favour him over anyone else at this precise moment.
He's a threat to any C and D level HW in a weak era who has a short reach, cement feet and a head which is a magnet for right hands.
Wilder has the one punch power to beat anyone despite being an extremely limited and overrated fighter. In possible fights I'd strongly favour all of AJ, Fury,Whyte, Parker,Hunter, Usyk, Ruiz and Povetkin against Wilder. Dubois, Joyce, Chisora and Bakole would all stylistically cause Wilder major issues being tough, come foward pressure fighters that would walk Wilder down having him on the back foot. These are the types of fighter Wilder has avoided his whole career. Also could imagine Gassiev landing his brutal body shots on Wilder? Wilder fell apart from an average body shot from Fury.