He is without doubt the best fighter of this HW generation as you say.

You can only beat the guys from your era and he only needs beat Usyk now to underline this era - if AJ does beat Usyk in rematch (doubtful) then he could take that fight but that is imo an easy night's work.

People will point to the quality of opposition but what can he do about that.

He's odds on to retire with the '0' intact. A prestigious club indeed