1.) Kerrigan is going completley against everyone, including Jimmy and his now somewhat-allied dominion forces.
2.) Jimmy just bailed on everything and is sticking by Kerrigans side, removing Valerian as an ally.
Although I personally am leaning towards # 2, I couldn't see how Jimmy would make it off the planet with an entire fleet of dominion forces who see him as a traitor.
Lemme know whatcha think!