QUOTE(Slander @ Oct 17 2009, 04:47 PM)

I don't see where you're getting that notion. BioShock 2 takes place a decade after the first game. Even if the good ending of the first game is what actually happened, Jack only took five Sisters with him. Five out of dozens. The rest were still in Rapture, under the protection of either Tenenbaum or Big Daddies, hunted by splicers. It's only logical that one might resort to extreme means to defend herself, including emulating her father figure, including kidnapping girls from the surface to make new Little Sisters to replace the dead and rescued ones.
Now I might be completely remembering this wrong, but I could have sworn the Good Ending of Bioshock implied Jack took
all the Little Sisters with him - Tenenbaum releasing them into his care, as she cared for the Little Sisters like daughters and wanted them free of the horrors of Rapture.
I also could have sworn the known backstory behind the Big Sister was one of those that Jack rescued returned to Rapture of her own accord (The "Bad Egg" out of the bunch, if you will). But yeah, "It Came From The Sea" definitely implies that Big Sister has been active, rounding up new girls to make the newest batch of Little Sisters (Which makes sense, because in either ending - Jack's depleted the Little Sister population by either deprogramming the lot of them (With the aid of Tenenbaum) or Harvested them.
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The first game very heavily implies that Tenenbaum has motives she's not letting us in on. I can't imagine she'd stay in Rapture after the end of the game if she didn't. But what are they? Is she trying to set herself up as the new ruler of the city, Fontaine-style?
I don't think anyone who's played Bioshock would disagree that Tenenbaum has her own agenda. Everyone in Rapture does. But I don't see Tenenbaum turning into this game's Big Bad, either. Her Audio Diaries in the first game - and indeed, her entire motivations in said game - generally paint the portrait of a Hardcore Scientist with a streak of Morality. She was the one who uncovered ADAM and created the Little Sisters - but she's also the one who wanted desperately to undo her mistake with the Little Sister.
I always suspected Tenenbaum's reasons for remaining in Rapture were the help the Splicer population. She really was the one who opened Pandora's Box, and I got the feeling from her character that she was just as amoral as Ryan and Fontaine, but trying to atone for her sins. That doesn't make her pure as driven snow, though. She observed the same mutations in the Splicers we did. She probably also wanted to study what long term exposure to ADAM did to the Human Body.
Hell, she might even be keeping the Vita-Chamber rezzed Andrew Ryan captive for no other reason then maternal instincts gone crazy (She blamed her change of heart on those instincts, in one of her Audio Journals).
I don't see Tenenbaum being the game's Big Bad, though. For one, it'd reek of retread with Atlas (The person helping you in the one you have to ultimately stop). I suspect Tenenbaum will be one of the first casualties of the game, actually. The developers have already promised we'll get more interactions with more of Rapture's stable citizens, so she's not going to be absolutely essential from a storytelling point of view if more non-Splicers show up.
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Who knows? My idea could be 100% wrong.
Guess we'll find out in January.
In the meantime, Speculation is fun!