Strategy: Swap turn meter with Traya, isolate GK (shield Sion up if none damaged). Fracture Padme and keep her fractured all the battle. If your Traya is very slow you can also begin with fracturing Padme instead of a swap. Attack Ahsoka, swap turn meter with Nihilus when swap ready, Annihilate Anakin asap (but watchout Cooldowns don‘t aoe when his basic is enough gain the required turn for his ultimate because you need a second annihilate) You will probably annihilate Anakin before Ahsoka is dead. Keep attacking her till she is dead and then attack the 5th toon or padme (if 5th is c3po) When annihilate ready kill Padme.
Stay away from R7 anakin if thrawn or some trio aren’t reliced.