Throughout the final mix remakes of the KH games there is added content, like extra boss battles and mini quests and collectables. What if in Kingdom Hearts 3, there is mention to these add-ons and are counted canon to the story? Like for example the Lingering Will battle in KH2FM, what if when the image of Terra in his armor is brought up by either Aqua or Ventus, and Sora, Donald and Goofy are like, yo! We beat a guy like that one time! Lol I know it's far-fetched but it's still something to think about