That Top Ten is awful. First things first.
Number 1: Nintendo would refuse to be bought by Disney, if refused to be bought by Microsoft.
Number 2: This is complicated to explain. But there's like this whole copyright thing
Number 3: I don't see people asking for Riku or Roxas.
Number 4: The Rules, Sora is STILL a Videogame Character, he started in a videogame, he was created in effort to make a new protagonist for the game.
Number 5: The Keyblade would have a extensive moveset Magic Commands, etc, it's not like Cloud had an extensive moveset, despite having the buster sword.
Number 6: Since Ultimate made some few changes to the Final Smashes, they can come up with other options, I don't think they would pull a Shulk or a Megaman.
Number 7: It's like saying Mario will be a frog suit or Tanooki suit variant.
Number 8: Crossover Shipping exists in all fandoms, Heck even me has shipped Sora with:
-Lillie from Pokémon Sun and Moon
-Arkayna Goodfey from Mysticons
-And Serena from Pokémon XY.
This isn't exclusive to Smash Bros, as for bad fanart in Smash last time I checked people draw amazing fanart of smash bros.
Number 9: Hater alert, Hater alert, we got a Hater.
Number 10: Don't compare the two towns, as for the stage thing, it could work, it could like that Lumiouse stage from Pokémon XY
The Creator of the Top Ten is probably hates Kingdom Hearts with a burning passion and the arguements are so poor and weak. Yeah you know what? Argue about a videogame character that hasn't been in a Nintendo console.