Let me know when you want the Senate to revolt and Yuna and Yukari can lead the charge. Yukari will spirit away Eleuseus, followed soon thereafter by Medea shortly before the revolt to strip Nero of her most loyal supporters and teach Garviel a lesson about learning about other shit than fighting. I imagine this will also make Nero and Garviel very paranoid and prone to make mistakes.

For the Homunculus plot, I am hoping we can convince a certain brotherly duo to do Greed, that would be a great place to get that ball rolling.