CLS Zeta. Which one?

I did his leader first. I'm finding it pretty good. I haven't run my rebel team in arena yet but I just did a whole GW them no probelm. CLS(l) R2 Jyn Cassian and StHan. Finished with protection on all of them. I only got a zeta on CLS lead too none on others yet. Cassian is really effective cause he's giving tons of tm boost when his grenade is resisted plus the tenacity up for StHan. I'm consistently getting turns. Pretty effective team but not sure how it would do in arena without a few more zetas