Right, I haven't played this game in a long time, so bear with me.
But, how on earth is Riku able to wield the keyblade?
At no point in the story is the player made aware that Riku is a keyblade wielder, so how could he take it off Sora in Hollow Bastion? It makes no sense to me, somebody explain please.
I've played every game available in the UK to date, yet only just now have I remembered, I never understood how Riku returned.
I know why he didn't make a nobody, because he didn't become a heartless, and his body was completely lost to Xehanorts heartless, so no body / soul, meaning it couldn't have sprung a nobody, fair enough. This means that after Dark Riku was defeated, his heart went to the realm of darkness. Well, this must've happened before Castle Oblivion, but being just a lost roaming heart in the realm of darkness, how did he get his body back? It never made any sense to me.
Xion didn't have to go. In the eyes of the organization, either Roxas or Xion could've went, they just wanted the ower of Sora's keyblade, and the way it was turning out Xion was actually going to be a better host. Though I haven't completely finished the game yet, aha.
This could actually work because it would be another reason why Sora could wield the keyblade, when Riku was chosen. I know that's because of the door to darkness on the islands and Riku's darkness and all. but it could still back it up.