Help needed for deciding on Omega and Zeta skills and general feedback on direction

Do not give zeta on Vader’s lead.
It’s not worthy for you right now.

Palpatine Lead seems the best.
Few days later, you can get Thrawn.
Make arena squad with zEP DV Thrawn GMT TFP. Those are empire characters which you have.
Arena is the most important thing for you because arena is the main resource of crystal.