The same universe that Sora finds himself in in the Secret Movie. they both teleport at the end of their battle in KH2. Goofy asks “Do you think they went back to their own world?” When Cloud is supposed to be part of the radiant garden crew like everyone else and Sora mentions “They went somewhere else”.

Then At the end of 3 Sora wakes up in shibuya and we hear a main theme to an FF game(Somnus) mash up with Dearly Beloved, with heavy implications of heavier Squeenix game involvement in the future. I think I could just be reaching but It’d be cool if this were the explanation. Or maybe we can even encounter Rinoa in this new reality, finally explaining the letter Leon gets at the end of KH1. What do you guys think?