Unfortunately, when that's been Nivemus's claim to anything and when Sirion and Nivemus on its founding has said it's simply new OR... Well, what do you expect?
Err. Yeah. A faith that only converts through preaching and prohibits many of the priest options (such as seizing regions) from being used is more dangerous than a faith that made continual attempts to take lands with such methods? :p
On the contrary, we haven't used that claim at all. At least not of any significance yet. All the regions we have taken were either rogue or Sultanate. Yes, they correspond with the boundaries of Old Rancagua, but that doesn't mean we have a claim from them... Kinda like how Westmoor doesn't have a claim to the next Oligarch JUST BECAUSE they have Oligarch City and like two people from back in the day Oligarch.
And a faith that is basically a powder keg, ready to blow up against any aggressive elves? The Flow wasn't always corrupt either...