You make some valid points but it's premature to say that Usyk only mucked things up "for a couple months". If Usyk (who also sparked brief HW Bellew and beat warhorse fringe contender Chisora) wins the rematch (and he's a substantial favourite) he will have eliminated former golden boy Joshua from the undisputed picture and seriously damaged his career, which was already seriously damaged by Ruiz, who administered the most humiliating defeat of all time on AJ and statistically one of the biggest HW upsets of all time: you can't downplay the significance of that. The Ruiz rematch also further damaged AJ's reputation even though he won. A shot Povetkin not only sparked Whyte out cold in his backyard, again damaging his reputation and likely health, he beat British HW's well above the level of final career fight Harrison in Hughie and Price. Usyk may go on to beat Fury too and become the king of the era, which would make him a far bigger thorn for the British HW's than Wilder has been. It's also a simplification to say that Wilder prevented Whyte from getting a shot, or an undisputed fight for AJ. If Whyte signed with PBC as Ortiz did (or possibly if he beat Ortiz in an eliminator) he would have got a WBC shot much sooner. And if Hearn/AJ had offered Wilder 50-50 and fair terms for a rematch, that fight would have got made. Wilder did delay Fury's ascent to becoming WBC champion and surely added a fair bit of wear and tear in the trilogy but in fighting Fury he greatly enhanced Fury's legacy: the Wilder fights are similarly important (and I would say more) in the career of Fury as the win over Wlad. Will Wilder return to the ring? If he does, will he be made mandatory coming off back to back losses to Fury and no wins since late 2019? Will Ortiz-Ruiz determine the WBC mandatory challenger? There is not much appetite for Fury-Wilder 4 and it's quite possible that Fury would keep his promise to retire if Usyk and AJ were unavailable for the next 18 months for whatever factor or combination of factors.
Parker was a former champion, who beat the man that gave AJ his first loss. He is also in the top ten of two sanctioning bodies if I recall correctly. If that's not grounds for a top contender I don't know what is.
Paint Dry Parker is hopeless. He looked unconvincing against many opponents and one of whom is Rice Pudding Jr who arguably won that. Paint Dry is nothing more than a stocking filler. Another "top 10 guy" for someone's record. Joshua fanboys seem to be obsessed with this.
Whole division scrumming for Fury's belt which he'll throw into the crowd after he's sang his final song.
He's the turd in the British punchbowl. Everything would've been great these last seven years for British fans if not for Wilder. Whyte fans blame Wilder for Whyte not getting a title shot sooner. Fury fans blamed Wilder for ruining Fury's 2018 comeback. Joshua fans blamed Wilder for not making a unification ... Then Joshua and Fury fans blamed Wilder when the Joshua-Fury unifiacation was blocked by Wilder's arbitration case. Wilder was the guy British fans said was 'holding the belt HOSTAGE" for five years. Ruiz didn't impact Fury or Whyte's careers. Usyk didn't impact Whyte. Hell, Povetkin wasn't a blip in Fury or Joshua's careers. Wilder was the person the last half-decade or more who prevented the Brits from running the whole division. That's all I was saying. Whether he was the "actual cause" or not isn't the point. He's the guy they ALL blame. And he'll be there again today with the WBC #1 contender tag when the winner talks about taking on Joshua.