I think Andy Ruiz Jr is not training for revenge on the other hand, Joshua is touched psychologically by defeat
Rule #1 of boxing....never start swinging with a Mexican. He would have been okay (possibly) had he just reset after the KD.
Joshua stopped developing around the time he beat prince Charles. The impression I get from him is someone who is satisfied financially and just tired of the PR and maybe even boxing itself. It is what it is, I'll be shocked if he wins a rematch but even if he does I don't see him going on too much longer.