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@Alarion I just read about it today - interesting stuff. However, that could be an (out of universe) explanation only if they didn't decide yet that Talia would be Control when they wrote the script for "A Race Through Dark Places", which was on Season 2, long after Takashima left.
@Terriblefan I haven't watched these episodes in a long time, but I found this reference - "Before leaving Babylon 5, Control taunted Ivanova, claiming to have influenced Winters to get close to Ivanova and her secrets." - babylon5.wikia.com/wiki/Talia_Winters - which seems to match what I remember.
@Valorum But I seem to recall that when the alternate personality was revealed, she told Ivanova that she (the alternate personality) was always watching and influencing the actions of the original personality (for example - causing her to get close to Ivanova). This suggests she had some sort of control over Talia's actions.