Or maybe *darksteelfoil hat on* the other Ascians KNEW Nabri's plan was doomed to fail and only thought we'd kill his physical form and he'd get a scolding for acting too rashly. When we actually destroyed him, they were worried but thinking "at least he took care of our annoying little brother" and scrambled to their respective areas. Maybe different ascians are tasked with different areas of Hydaelin, and Nabriales just butted into Eorzea when we foiled Lahabrea, with Elidibus trying to "convert" us.

Oooor, most likely, the devs didn't want to use all the Ascians just yet, making it so we off one or two per x-pac...