I think that the arguement that SM2 is not an actual mario game isn't legitimate as to say what can be "officially" part of the nintendo universe... afterall, that game gave us shy guys, which were used in later "official" mario games. Also, Krystal came into Starfox much the same way. Dinosaur planet!Super Mario 2 is not even a real Mario game. It is Doki Doki Panic with Mario sprites placed over it. While it was a decent game I don't think they would base the entirety of the new adventure mode of Brawl on this strange game that was not originally intended to be what it is. Plus its a Mario game and while SSB is heavily Mario, it is NOT a Mario game.