I'm actually hoping that our reason for entering Ala Mhigo is something that forces us to set aside our grudge with Garlemald and work alongside the Garleans. Perhaps Regula pulls a Kefka, betrays Varys and then decides to test out his new powers on Ala Mhigo. We make a push into the remnants of the nation to help rebuild it and encourage Ala Mhigans and Garleans to work together and push for peace so that the greater threat can be addressed. It'd be very boring to me by comparison if the storyline is as simple as liberating Ala Mhigo and slaughtering Garleans at every turn. That wouldn't feel very 'Final Fantasy' to me. As I've pointed out many times in the past there's a long tradition of antagonists becoming allies - at least for a while - or being far more sympathetic than initially presented upon their side of the story being shown.