User blog comment:InklingChris/Super Smash Bros: Emissary Returns (Fanfic ideas)/@comment-6684591-20151118004320

I like that idea. Personally, I have a theory about the Smash universe. When characters cross over to the next iteration of Smash, they actually leave the previous Smash world behind. Basically, Brawl Mario, once cleared for passage into the 3DS/Wii U world, would depart from the Brawl world and enter the 3DS/Wii U world. This means that Mario would no longer be in the Brawl world. There is something sad about this theory though; Ice Climbers, Wolf, Snake, Ivysaur, and Squirtle are all on their lonesome in the Brawl world. In the Melee world, Pichu and Young Link are all by themselves. Roy and Mewtwo were their with them, until Master Hand and Crazy Hand invited them to the Smash 4 world, after which they left.