That would be cool if it picked a random choice for Revan in K1 if you choose the "don't know" option. It would be a good surprise until you play through a few times. It would make rolling through the same story over and over just to catch small details and a new ending a whole lot more interesting.
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That would be nice, too bad Chris already stated that if you choose the "Don't know"-option, the game will automatically set that Revan was a male and it was an LS-ending of KotOR.