heres my theory:
before the universe was in creation, there lied two elements that made up space: Light, and DARKNESS!!! both were seperate, when a little bit of darknes crawled it's way from the plant of darkness itself, into the plant of light. both created an abnormally large beast, who in which took both elements, and created a world called (name not thought up), and made refudge on it. as the area got bigger, the light and darkness cloned themselves into 4 other beasts. then the light and darkness created a shadow..a shadow so large and frightful, the five beasts fought it off. then it made itself into a second third, fourth, world. each beast took refudge on it. as the worlds got bigger, they shrank, and thier intelligence increased. land appeared eveywhere. out of all the beasts, there was one female, and i guess you all could guess what they did...and as life increased, they now were normal human beings, who created a new world. then they discovered the keyblade, blah blah, there was a war, but two of the five "early humans" who were in armor, died. they were the best of friends, and both had so much heart, both hearts carried on, and one heart was born as soras dad, then his son (sora) carried on the next heart. and as for the beast, the thing tries to kill sora!!!
yeah, that sucked...