Atm Sirion is split almost in half between GX and the natives. We could cause a lot of trouble were we so inclined, but I don't think any of the Xavax are deeply inclined to be so. But we never intended to stay in Sirion. We can't, not if we want to really jump back into the war. It's a full week's march from Sirion's capital to the nearest Vix territory, which is too far to reliably fight the Southern Alliance. We're just a bit...stuck atm.
The current RP ought to clear some things up, one way or another.