The 'what if' is important insofar that we realize the "plot", what little there is, would be the exact same had you replaced Kreia with a generic bit character. And that the plot did nothing to actually serve Kreia's supposed plan.

Actually... that goes to further prove the writers failed to write Kreia as a villain.

And I still want her scheme explained to me. The Exile being a wound in the Force and Nihilus as a black hole sounds like it could be used to exact some serious crap upon the galaxy, or possibly heighten the chances of nullifying the Force...... BUUUUT nothing close to that ever happens at all in the story.