So I tried a lineup of SLKR (L), KRU, Hux, SiT, FOST. I used FOST instead of FOO because under a SLKR leader any dark side supports die quickly (they get turn meter whenever they gain advantage). Hux is still worth having in there because P1 is the toughest phase, so he can at least help you get through that. Overall, I found this combo a bit more chaotic and it was harder to manage annihilate and the shield. Because they were hitting Nihilus all the time he was taking a lot of turns and I had a lot of debuffed characters, so his AOE was reducing the cooldowns on it quicker and my timing was off. I ended up having a couple characters annihilated because I wasn't paying close enough attention. Also, FOST died pretty quickly because he doesn't have any built in healing like KRU and there are no other healers on the team without Thrawn and Hoda. So overall, I'm not sure this lineup brought much to the table over what you'd get with just SLKR, KRU, and maybe Hux. But if you manage it carefully, it could probably work.