Well, besides the civil war in Sirion, you have Eponllyn, Sirion, Caligus, and Nivemus all allied. Add in Alara, Perleone, and Vix Tiramora who are all allied with Caligus; Fallangard who is allied with Eponllyn; that's a sizable portion of the continent. Even if we take out the extended alliances and stick with the main players, that is nearly the entirety of the northern half of East Continent. The only realms currently fighting against this directly are Oligarch, Vix Tiramora, and Perdan. Vix Tiramora seems to be a wild-card.
That is if you only follow the official diplomatic relations. Eponllyn wants to see Sirion reduced, the alliance between Sirion and Caligus is reduced to nothing. Eponllyn and Caligus only recently fought against each other and there is not a lot of love between the two as far as I know. Perdan and Caligus also recently fought and Vix is a bit of a wild card in between positions.
In time Sirion will be divided, creating a whole new situation in the north as well. The alliances on EC are also more fledging than the 'federation deadlock' we had on AT. Within that 'big alliance' you mention are also enemies of each other. You can also get alliances just for the sake of one war and then change later again. They're different than federations for a reason.
