If Armonia capitalizes on the rogue regions around it(namely Ibladesh City) then they could be a powerhouse. I could see them even warring with Caligus over Isadril eventually, and winning. But that is if they capitalize on the rogue regions and if Perdan and Caligus don't decide to interfere with them in these early stages of development.
Eponllyn I see more of as a breadbasket Trader realm. They can get a couple more rural regions, but that would be stretching their nobles thin. They have a couple decent cities but, barring the possibility that they team up with Armonia and possibly another realm against Perdan, I don't see them becoming a powerhouse.
But in order for my hypotheses to play out, we need Ibladesh to die already(no offense Ibladeshians, but you had it coming after waging a 2 on 1 total war).
