Looks like the series is really sort of adding some extra layers to Rise of Skywalker's backstory here and there-that Exegol was always sort of intended as a back up plan or something like that. Also it's clear Ochii is not the sharpest tool in the shed, so no wonder he wound up meeting a bad end.

Wonder if that'll fit into whatever Mandalorian is doing with trying to clone/extract from Grogu, which seemed to be hinted but not exactly resolved in season 2.