How would the Byron story have been different if Claudia Christian hadn’t left?
It’s no secret that I would’ve had Ivanova becoming somewhat linked to Byron romantically (she would see him as a character like Marcus, which is why there are certain similarities, and she would take a chance only to find it wrong this time, underlining that she’d missed her one major opportunity thus far for a good relationship). This was expressed to Claudia toward the last part of S4, so she knew at that time that her latent ability would be coming out, and that she’d have a big part in S5.

JMS, as per http://www.midwinter.com/lurk/guide/099.html