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So an idea I had was that maybe this game is about parallel world versions of Riku and Sora, that just so happen to exist simultaneously as the main series. This explains how they can be young yet fighting enemies and going to worlds that are from later in the series. (It also kind of symbolically explains the "Raining Soras" opening)
I mean if you think about it, the Kingdom Hearts games are all about parallel worlds anyway. Deep Jungle, Clock-tower portion of Neverland, Agrabah, Beast's Castle, Land of Dragons, etc. etc. all of those are just parallel versions of Earth, just focusing on different locations and time periods. But they're still just parallel Earths.
Up until now the KH series has been pretty simplified about the different worlds being completely different places, but the fundamental rule has always been there. The Kingdom Hearts series is about Parallel Worlds, so within it's own premise it's logically possible for there to be parallel versions of existing characters.
Granted, this could get really complicated really fast, and you can just imagine how that would fit into the plot, but it's just something to think about.
Death comes for us all Oroko Saki, but something far worse comes for you. For when you die, it will be....without honor. -Master Splinter
RedDeath long time no see. You're a rare poster. Good to see you back after such a long time.
On to your point, I wouldn't rule it out. With all the plot elements and Nomura gets away with and by this point we've already done time travel and for no reason at all Sora in KH2 being able to battle Lingering Sentiment from Mickey's Castle, I can easily see alternate worlds and timelines.
Up until now the KH series has been pretty simplified about the different worlds being completely different places, but the fundamental rule has always been there.
IIRC the realm of light(where the games take place for the most part) was destroyed in the Keyblade War. It apparently used to be one solid plain of existence, but was broken and scattered in the war. Each new fragment then became it's own world. So, kind of all worlds ARE the same, just not parallel, simply pieces of a whole.
Supported by wings of faith, Wielding a sword of light. I am a believer.