JMS also said at the time (who knows how much he might've exaggerated this, but the way the show handled certain cast exits seemed to bear him out) that the overarching plot meant he had to have "trapdoors" under nearly all the characters, so parts of their plot could be transferred to others or otherwise the show would've gone down in flames. He also said he liked to metaphorically stand there with a gun and ask "Who could go?" at the end of a season, to shake things up. So Lyta shows up in the pilot, but then her actress wasn't in the show again until season two, so Talia took over some of her plot until Lyta came back! and so on. But even though they were switched around in the plotlines, the characters were very different, like Lochley and Ivanova were.
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