Sora is a considerably powerful character and is seen as such by more seasoned characters (Mikey, Yen Sid etc) But is all of his strength due to his heart alone? Sora's heart currently contains Ventus, Roxas and Xions hearts. Which I believe is what is pushing the power behind him. However, in KHIII I feel like its safe to assume that Ventus will be awakened and Roxas and Xion will find a way out. Without the power of their hearts, just how strong is Sora's heart? Will he be weaker or more venerable to "dark forces" without the aid of the other 3?
Perhaps he could be more powerful after realeasing their hearts? Maybe their hearts are weighing him down a little? Idk the amount of light within Roxas and Xion's hearts but considering darkness lingers in every heart and they don't seem as...pure(?) as Sora. Maybe they were holding him back? The game doesn't really say anything about the strain that multiple hearts can put on a single person, probably because Sora is the only one we know of that has contained anyone's heart other than his/her own. Still...
Perhaps he could be more powerful after realeasing their hearts? Maybe their hearts are weighing him down a little? Idk the amount of light within Roxas and Xion's hearts but considering darkness lingers in every heart and they don't seem as...pure(?) as Sora. Maybe they were holding him back? The game doesn't really say anything about the strain that multiple hearts can put on a single person, probably because Sora is the only one we know of that has contained anyone's heart other than his/her own. Still...