just realized the knowledge of the narrator dies with leon lol. like, leon KIND OF told gemma about it but gemma didn't like. believe him? she probably immediately forgot about it.
far more compelling for me than the fact that narrators can time-travel is the reason WHY narrators can time-travel. in-universe acknowledgement of "nothing in their universe exists outside of the things that are 'on mic'". if it isn't in an episode, it didn't actually happen. that's an actual rule that exists in the story. it has been canonized.
the stamatis's parents never spent a second alive. gemma and charlotte never actually had their wedding. every single character has only existed as far back as their flashbacks can throw them. and that's IF they have flashbacks! flashbacks are not common! leon dragging michael out of the bar didn't get a flashback, so it didn't happen! like not in just the implicit way that applies to all characters in all stories, that's an in-universe rule!
but what's really getting me is this:
greater boston starts with leon killing himself. it starts because he kills himself. the foundation of the story is leon's death on the roller coaster. that's why everything else happens. leon's death makes something in their strange world into a story worth telling. the story is the only medium through which their world is allowed to exist.
leon's death is what brought their world into existence.
or, fun reversal, the world was created SO leon could die in it, which would then create a story intriguing enough to justify the existence of the rest of the world.