did organization 13 like totally forget about CO? or was it decided that it wasn't important? what do you think? to be honest what was ther plan for it in the first place? we know Marluxias plan but what was Xemnas plan.
it was most likely xemnas personal agenda to use CO, but not something important like kingdom hearts.
in kh2 final mix, didnt they give the hint that CO was something that xemnas wanted for the room of awakening?
i think the whole adventure with sora and riku proved to xemnas that the room of awakening isnt in CO.
but...this is just a wild guesss