First gear them all at least to 11 before a Zeta. But if you really want to.... read how each one changes the move. I did Zeta Zeb and Hera. Keep in mind how to do the most damage (I don't run Kanan anymore because he makes 70%chance to counter for everyone with a negative effect on his basic. Also to do major damage with Zeb you need less negative effects on enemies.)also any ability block makes the Zeta useless for any of them.
The team is still a lot of fun to find the best/fastest way to end other teams in GW, TB, and raids.
Never auto this team. The comp make them always use special's when you want to actually save them for when you need them for a special effect.