Even if Ala Mhigo isn't next for some reason, there is very little chance we will go to Garlemald before liberating Ala Mhigo, as well as right now Garlemald is probably too well defended. If in the next xpac we deal a crushing blow to their forces (like taking down multiple Legates and the like), we might be able to invad Garlemald, with the xpac after it being going to Ala Mhigo where the final battle against the Garlean Empire would take place (as whoever powerful was left would have flee'd to it basically)

But basically at best I see Ala Mhigo being 4.0, and Garlemald being either 5.0, MAYBE 6.0.