Multiple choices for Z - yes, another thread about this.

Option 1. If you run zMaul, Nihilius and Sith assassin, you can easily go first, daze everyone and extend their cooldowns. Same as with JE and droids but 100x better. Because this squad is great on offence, I expect to run them for at least 3 months while hording gear and crystals for the next meta :)