to me it would have made more sense if the Sire was the actual Main villain of the Storyline and the jailer was just some angry confused dude that didn’t notice the Sire’s treachery.
the Sire being the Main villain even if it would have made yet another annoying plot twist to the storyline would have made FAR more sense in the end considering on what realm his is in charged off and what power he got and where said power came from.
this would have made Sylvanas actions with the Jailer make more sense and this would have made the Jailer actions of fear for a uncertain future make more sense if his fear where a deception from the Sire that tricked him into thinking he was his only true loyal brother that was trying to help him save the universe but instead the Sire was just trying to gain more power.
just saying Blizzard had the perfect villain for the shadowlands and they screwed it badly…