I haven't any clue if anyone has ever brought up this subject, and if their is a thread on this subject please direct me to that thread.
Okay, in order to come to this conclusion, first you need to accept the existence of the four worlds that ansem speaks of:
*The World Of Darkness
*The World Of Light
*The Present World
*The World In Between
We already know that their are 4 known keyblade weilders. I this coincidence that their are four worlds, and four keyblade weilders, I think not. Mickey is a weilder, as is Sora, Riku, and the BHK. Even more of a coincidence is that each of these people could easily be classified into each of the worlds.
First off we have King Mickey. Would it not make sense that he would be the weilder of the world of light. In the game, he is always represented as a pure character. At some points a golden aura surrounding him. This would symbolize a godly person. It just clicks that he would be the weilder of the world of light.
Then their is Riku. On Destiny Islands, Riku chooses to let the darkness take him, thus he would become the weilder of the world of darkness.
Roxas, is from twilight town, the world in between, and we see he is a weilder, thus it would make sense that he would be the weilder of the world in between.
Finally, we have Sora. Given the keyblade by the light, he exists in the present world. Thus being the weilder for the world of present.
Please tell me what you all think, prove me wrong, or agree whole heartedly, give me your input