Regarding about something I think it has to do with the plot; "I've been having these wierd thoughts lately. Like if is any of this for real or not?" "Dreameaters, nightmares, the symbol when heartless and the Dark Chirithy merged, the side-effect of the bangles and a second dream it mention..." "Then the dreams, the sleeping keyholes, every single character that is unable to awake because of a missing part of their heart, the keyblade graveyard and the tides between each character..." "Lights of children rebuilding remaining pieces of the world, like some sort of wish, or dream." That being said, and a lot more other things that chain up, means that one of the sources of power that pushes things through, more than light or darkness, is the dream that every single fragment will fall into it's place one day, which means the sleeping keyholes of the worlds were actually, more than just an exam, eas actually part of awakening and recovering all of these worlds previously seen, such is the case of the worlds swallowed by the darkness, which Sora, a -born- child was -chosen- by the keyblade by an -"accidental"- fate, having him returning several lost worlds by stopping the -End of The World-, when, as well, -children- rebuilt what remained before it would've vanished forever, or maybe actually sent to do so, which means all the keyblade wielders gathered... and at last, the fact that it has a direct impact in what Kingdom Hearts turnrd out to be, and as far as we all know, Sora and others are not the only ones who can wield the keyblades, for instance Lea, and on the otger hand, the seen transformations of a place, C. Oblivion/C. Of the Land of Departure, where there were actual training keyblade wielders to depart on various tasks that were interrupted by a man that holds a Keyblade as an aprentice of another Keyblade wielder, an aprentice that was never chosen, but had a bigger role, and, the goat design on Xehanorts keyblade and what symbolizes (which is actually something really peculiar, having that it matches up with him and someone else I know about). Having all this said, if the True Kingdom Hearts is made of Light and all hearts return to it, where exactly do the hearts go? And what about the possibility of choosing where to start? Riku's words cleared up most of the doubt when he said; "why are we here? We could've easily ended up anywhere else.". I don't think that's all, and from what I xan confirm more than what I've seen, hearts don't exactly go into oblivion, they simple move into another body (possesion, rebirth, revival, refuge are a few examples of how the heart works in this universe shown), which is exactly why I got to suggest that Sora, as well as a bunch of other characters, aren't abscent to this rule. Concluding, not a single clue who the goddess refers to, even having highly-probable evidence, it doesn't cover thst much, but there's more story before back cover took place, I'm sure of it.