2 zetas: Deathtrooper/Krennic or R2D2/Qui Gon Jinn

The Jedi comp with R2 will allow you to be very good on offense, even wothout GK. Use Smoke Screen on Aayla or zKylo and they are fun to play. Now, a lot of people focus on Jedis in arena so you can drop easily.

In your DS team, you would need a tank instead of Vader, use ShT if you have it or RG/Stormtrooper. Otherwise, you will lose Krennic or EP very quickly.