I think that in order to be able to seriously talk about the Fury - Usyk fight as a competitive one, it is necessary that Usyk gain at least a little weight (can he, given that he has already moved to a new weight category for himself?). Now Usyk weighs 100 kg, and Fury 123 (or already more) - 23 kilograms of difference, in fact, they are in different weight categories.
He will lose his speed and probably his accuracy if he gains more weight than he can afford, he is ok with his current weight as long as Usyk maintains that speed and accuracy, he can fight anybody as he did with Joshua and beat him, heavyweight is the only division where there is no maximum weight limit, Usyk if ever will add more weight it will not be more that will hinder his speed.
Everyone understands this very well, which is why this is an acute issue - otherwise all boxers would easily gain weight and fight only in heavyweights. I remember how Roy Jones Jr. lost speed when he was forced to put on weight.
We all know what Fury is capable of doing in the ring but now he has the added motivation of being a unified undisputed heavyweight champion if he can get past Wilder again and if can beat the winner of Joshua vs Usyk II. Even if Usyk defeated Joshua again then managed to put on weight, he will be no match for Fury.
Sure. But in fact, I have high expectations from Wilder, I think that history can repeat itself (as in the match with Joshua - Usyk) and if Wilder can overcome his mental problems, then with the right tactics he will have high chances against Fury.