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Easy. Takashima would have been the one to be Control. A Psi
Corps plant. (Her background on Mars would've been the perfect time
for it to have happened.) When Laurel went away, I took that one
thread and passed it along to Talia, setting it up as early as the very
first episode, when Talia and Ivanova first meet, and later reluctantly
have a drink.

At one point, Ivanova says to Talia, referencing Ivanova's
mother, "You're as much of a victim as she was." To which Talia
replies, "I don't feel like a victim." And, of course, that's exactly
what she was, though she didn't know it yet. Ivanova's analysis was
100% correct.

jms