While Ebb and Flow gives turn meter bonuses to Empire characters, the zeta doesn’t affect that part of the ability. So the decision to zeta the ability does not depend on an Empire squad. Instead, it makes Thrawn more of a useful and effective character when someone is fractured and he’s just standing around.
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December 2016 Arena Shard
Especially in the Sith Raid when the boss is Deathmarked.