Not quite like any of them, no. But that doesn't mean that it wasn't one.

[ Even in the dream, though, Sora hadn't had his Keyblade. Which means that being able to seal the world off would be impossible. Then again, he hadn't been lucid enough in the dream itself to even try. ]

But that doesn't explain how we ended up there, and what we were supposed to do there.

[ He sighs and leans his head back against the wall. If only he could be of more use here, but this is just another mystery on a large heap of them. ]