JManM
If Ulfric continues with this stupid idea, I wouldn't be surprised if in the next few months a letter arrives to Jorah telling him that Ulfric had an "accident" while out hunting. Stark would do it without blinking because of his STAB Alliance, and Jorah wouldn't blink either because he's counting on Lyanna's stupidity in the south. Without that spark that ignites everything and brings the Starks to the brink of extinction, it would be more difficult for Jorah to reach the top. He's not even the most qualified possible heir anyway, so his death wouldn't matter much.