I'm thinking/hoping the Alliance is more forgiving to the Garleans, especially after the Ascians' machinations come to light. While there will undoubtly be factions that find their actions unforgivable (understably, given that some were still ok with genocide, Ascian manipulation or not), especially amongst the Ala Mhigans, at least Kan-E has been more open to forgiveness and succor (that one garlean soldier she healed and became one of her guards comes to mind). The Syndicate was already flirting with the idea of joining the Empire if it meant better trade so there would be little argument there...
With the Ascians running the Empire from the shadows it does seem more likely we'll join them in a grudging alliance to wipe them out. I HAD mentioned before that, given Varis' general annoyance to grandpa not letting him rule his own empire, it opens the door for him to reach out to the WoL/WoD/WoB in a "I fought a literal war for this throne, it's mine, no one else's" Unless, of course, there's another brother hidden somewhere...
(as an aside, I've been meaning to compare notes on Ivalice with Theodric but, alas, Blamung remains locked)