This is just something i was kinda thinking about and its obviously not true but what if at the beginning of KH1 on Destiny Islands when Sora found the mushrooms the contact with them actually induced a really long vivid drug trip. Like at one point in the secret cave you get a mushroom and you see the man in the cloak for the first time. It all adds up! Lol and Xehanort went back in time to plant them there on Destiny Islands