Ha! That is my theory, that Evil!Talia was implanted after this happened. Scads of time we don't see her; she's not in every episode, and Bester now has reason to not trust the leadership of the station. My husband maintains Good!Talia was the overlay, and Evil!Tania was the base, so she was there already and Ironheart just missed it, being in extremis and all.

I have something in mind for Talia in an upcoming fic, but it's one of my bizarro AUs so it'll be different ;) It's always different...