ok idk if this has been thought of already so bear with me, i think that the sequel game to birth by sleep is gonna revolve around an older ventus and mickey working together and they battle the first heartless, why i think this is bc well we all know that in kh1 ventus is no where on DI and that looks like where he was left at the end of bbs, so where he go? either he was nursed to health and went on to find mickey or mickey found him and mickey and yen sid further trains ven in the art of the keyblade so he can battle whatever heartless are created at this time i mean come on, heartless couldnt have just appeared when sora and riku become weilders, so someone have to have had fought them when they came into existence...mind you this is all just my theory....anyway it makes sense to me a little..let me know what ya'll think or if ya'll have better theories i would like to hear them