Yeah, might be best to put spoilers and so forth in sppiler tags around here. Posting spoilers here (especially when they're related tot he character in question that the thread is the subject of) isn't as bad as posting'em in the episode of the week thread, but it is best to put'em in spoiler tags anyway.
Anyway, I believe the general consensus is/seems to be that if Kallen trying to understand Lelouch, which has been what her character development/focus has been all about since the start of R2, doesn't play any role later on, it'll be very... odd indeed - as well as frankly a waste >_<
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