Characters from other fighting games weren't supposed to have a chance either, but then we got Ryu. Pretty much every "limit" is being broken one by one. At this point, we are basically only one step away from having Masterchief in the game, two steps away from having Goku, and three steps away from having John Cena. The sky's the limit.

Nintendo never said that, I bet. That's the fans, with all of their silly made-up rules for who can or can not be in Smash, who said that.