ive tried beating it with 8 tier gear on all members and can manage to get thrawn down to about 3/4 health but still using only level 80 characters. I first of all ensure that chopper takes the first fracture then taunt after with kanan as he can take much more(fracture knock him out to soon) then have the stormtrooper taunt removed by ezra. start to lay into one death trooper then knock out the other. i then went for the healers, then finished the taunt. finally going for thrawn but at this point he seems to take everyone out so i might see how i go when i get them to 85. but since i can do so much as is i feel like itll be fine to take him down with the extra 5 levels each character