Shitenou/Dark kingdom generals in Crystal tokyo?

[Knight of Ranko]

Where would the 4 Dark Kingdom gneerals be in Crystal tokyo, if we accept as a given they've been Ressurected or Reincarnated, and redeemed themselves?

specificaly, any ways to justify them being there, without having appeared in the brief glimpses we get of Crystal tokyo in the Anime and Manga?

It has potential in Fanfiction