I was actually trying to figure Tarkin in as well. I have a 7* gear 6 Tarkin that I left in the dust because his damage was too low to fit in my normal team, but his utility is absolutely amazing. For the similar roles they play Phasma just tends to work out better for me, but that could be the gear difference.
With all of the Leia teams running around Tarkin speed down on rebels is kinda nice though.
I'd be tempted to run Poggle and Tarkin but due to the relatively slow speeds of most high damage AoE characters I think Poe is a must. I could see Tarkin instead of Poggle but I'm not sure which offers more to be honest.
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With all of the Leia teams running around Tarkin speed down on rebels is kinda nice though.