I think that scene was important, because she's the one Leckie has been writing to. He said to her, "maybe I'll write you", even though it was apparent he didn't know her very well.
I agree that the character development hasn't been as strong in Pacific, compared to BoB. For me, BoB was an instant hit, even though I wasn't planning on watching it originally. The cast was mostly perfect for that series. So far, this series doesn't have a Winters or Nixon.
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