I don't see Perdan building big alliance blocks that will hold to be honest. They are powerful, yes, but in the current situation I'd say that's a good thing.
How the hell did you pull that logic? So Xavax, which is at a stalemate with three smaller realms, is a threat to the entire south, while Perdan, which is already the most powerful realm on the continent, is merely a sideshow? Besides that, the only realm Xavax is allied to is Fallangard. Your viewpoint is pretty ignorant about the South as a whole.