Have any of you been watching "Into the Badlands?"
Wacky baseless fan theory:
The Badlands are 500 years ahead of us. Fallout is 250 years ahead of us.
What if they're the same? What if the Badlands are what happened to the Fallout world in another 250 years?
There's lots of great potential here.
What if Azra is a city that somehow thrived?
What if the "Dark Ones" are the result of a fallout style experiment?
Barons are servants as much as overlords. What if their liege is from Azra, and rules from a Vault complex? This knowledge would be secret, passed down from Baron to Baron, but since Barons kill each other off so much, maybe they forgot? Maybe Azra sends out kids like Sonny and MK with those medallions as reminders of who is really in charge?
Maybe reuniting the whole country at once was too hard, so regional baronies were established by Azra, a city in the NCR maybe, to help keep things stable until such time as little regions ( baronies ) could be reintegrated into the new Union?