Actually, Warchief tried to ally with Xavax when we went to war with Alara, then joined Alara when JeVondair turned him down. I saw the messages myself. Seems like Minas Nova only wanted to support Alara because they didn't get the chance to have an easy gobble of Alaran regions. Magnus didn't have anything to do with it, Hell he wanted to ally with Alara and focus north on potentially fighting Perleone. Fighting Alara was what the rebels, yourself included, were pushing for, and got as part of the compromise that ended the rebellion.
