I regret putting a Zeta on _____

I was thinking zQGJ like others, but thinking about it, though I rarely use it, maybe 20-25% of the time it helps me get through GW when there's a particularly difficult node 11 I start with jedi then finish off with arena team (Rex, Chaze, DN, zKylo). Kylo was my second zeta and I was strongly influenced to choose it not Maul because zKylo isn't a leader ability so more versatile.
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I have enough that I'll zeta Finn and Cody for HAAT (our guild prepping for it) next, not just for HAAT but also the Resistance and Clone squad mechanics seem interesting.