During the Diablos hunt there were some kids which we found later to be ghosts.But they looked so real we would never guess.
The same thing could be happening on the Lowtown.
The citizens could be the souls of the Nabradianīs trying to get revenge.
After all they were put under mist making their souls attached to this world.
That would make old Dalan either King Raminas or Raslerīs father.
I think they even know who is the true villain of ffxii and secretly try to stop his plans.They PROBABLY need Rasler to reincarnate.
That way Lowtown could very well be the "Zanarkand" of ffXII.