This is just a theory I have. Ok, from 3d, we've pretty much established that Xehanort's 13 darknesses will be comprised of different incarnations of himself. One being his younger self. But therein lies a problem, or maybe a solution. If they are all xehanort taken from different points in his life, wouldn't killing one change the timeline? What if after they are a defeated, history itself is changed, to where the xehanort saga never took place? Think on that.
This is just a theory I have. Ok, from 3d, we've pretty much established that Xehanort's 13 darknesses will be comprised of different incarnations of himself. One being his younger self. But therein lies a problem, or maybe a solution. If they are all xehanort taken from different points in his life, wouldn't killing one change the timeline? What if after they are a defeated, history itself is changed, to where the xehanort saga never took place? Think on that.