Agreed. If you're completing GW regularly, then you can unlock all the available ones quickly. Try them out and see which you want to star up. But definitely get Phasma.
I went Poggle second, and have never regretted it. He's kinda awesome. Then went to Phasma, but quit at 6 because I find her annoying, both in my own team and anyone else's. Finishing 86 now instead, because having an extra double-tap hitter is always nice.
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But first Phasma.
+1
I'd use poggle in almost every team for his offense up. He makes things so much easier when even your low damaging tanks can 2 shot someone 0_o