Plus since they decided the LS would be the "canon" or whatever, that means that jolee had to survive really.
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But that's not it. The developers must cater for all possible outcomes. That's one of the reasons Jolee and the other folks never appeared in K2. The game was a sequal, and because stories must continue without plot breakups, couldn't just take the "canon" way. As it wouldn't be the story of those who played as eg. a darkside female. The canon is just for EU books et all.