Strategy:-
1. use Echo Stun to stun droids
2. Recommend killing droideka if present as he may nuke shaak or fives by RNG
3. General tankiness of team should allow you to survive a few GG AoEs
4. Pass damage around and wait for Rex Special on GG
5. or if you are at similar gear levels, you can just destroy 1 droid at a time. At similar gear levels they should be able to survive the AoEs, or fives Sacrifice will trigger making it an easy win