How is that possible? Sora and the others DID NOT exist in the past. This is BEFORE Sora's time. And don't double-post. That's spam. Just edit your entry.
And here's the proof you asked for:
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This is everything Nomura has stated about the Secret Ending of Kingdom Hearts II. These are EXACT.
I would at least say it's an episode in the past
Those three are completely new people who haven't shown up at all. In fact, I've already thought of their names. Back when I was making that movie, I only had their settings but now I've even drawn their faces to give myself a clearer image of them.
The king, Sora and Riku's keyblades were there, too.
It's to show that those three armoured people aren't them but that doesn't mean they don't have connections. The words "Keyblade War" that showed up in the middle were to implicate that there were fights between Keyblades. Most of the puzzles in the first KH have been solved in KHII but there are many things about the Keyblade that haven't been revealed yet. A line from the previous game's Ansem Report #8 appeared in the movie but that is to say "It means this but it's not explained yet."