Whatever the take on this, it still leave a gaping logic hole.
The POINT of the show is how Haruhi is an enigma of cosmic proportion that every faction wants to have a hold on it for one reason or another (keeping the world from being destroyed, learning from her unique case/etc.).
If Yuki was able to bascially take control and manage Haruhi's powers, then it means that she's able to do precisely what everyone wants to do. That just doesn't make sense.
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