Are DK, DT and ShT arena viable for long?

I guess I’m curious as to whether this will work without thrawn. Obviously he’s crazy good and super versatile, but I’m not sure who i would take out to put him in ShT heals and grants buffs, DT and Krennic do just about everything else. Maybe ShT isn’t the best behind EP since he doesn’t debuff, but i think a tank would give the whole team a lot more survivability. Is thrawn a requirement for any good empire team?