From what I've seen it seems like Hades, being the only major bad-guy from the first game that wasn't "destroyed" will be calling the shots, and SBW is his number 1 lackey.
The slightest flutter of a butterfly's wings could cause a typhoon half way across the earth - Chaos Theory.
So I have a theory. We get all the damned butterflies we can get out hands on, and point them at France...