But that's the thing. He faked his own death, left them to fend for themselves, and went off to be part of a group that was planning to blow up planets. He can TRY and reassert his authority, but the question is if people would automatically obey him? They might say "you abandoned us, Medusa is the one who's been actively trying to help/protect us, so why shouldn't we just follow her?" This is especially true of the Nu-humans, who have NO allegiance to BB. Medusa is the ONLY leader that they've interacted with.