If there's an alliance bloc that people should be worried about, it's the one Sirion is a part of. Yes, it might have been temporary in nature, but that many realms allied is still not healthy.
In all honesty, most of those alliances are meaningless. Caligus - Sirion is hardly considered a true alliance and Eponllyn - Sirion is a strange/delicate situation alltogether. Much will change in the coming time I hope, but we'll see what Perdan decides to do, as well as Sirion. Caligus too seems to have gathered many alliances, but so far their war with Xavax seems not to be coming as both sides are afraid.