It's a moot point asking if Joshua should retire or not: he can't. How could he ever live with himself if he didn't try and seek vengeance? It would be smart if he did retire, but he simply won't, so no need to debate it. I don't think Joshua is well-rounded enough to really go down as an ATG, though. He will fight on, win some, lose some. Unfortunately now, the big fight is Fury vs. Usyk, which will be dull, and likely one-sided as Fury is too huge. We have to sit through that at some point. I actually hope Wilder knocks Fury out, as him vs. Usyk would be very interesting. Wilder is the most exciting of the current crop, and without him things will get a bit dull.
This is referring to the 100 million deal when Hearn was still signed with Dazn. Wilder didn't take it and fought Fury for less money. Hell no matter what deal he was given he still fought Fury for less money.
Canelo got out of the deal and sued them due to issues with opposition selection and wanted money in damages. It's not because they couldn't pay him over the course of his potential fights.
Wilder defends his Ring/WBC World Heavyweight Title against his mandatory Wallin in late January/early February.