0RLY
A great conversation filler at bars and parties
That is definitely plausible since Sakurai was shown to roll right (leaving MM facing left) then immediately turning to fire the buster in the wrong direction... followed by Mario rolling into MM's buster. It would be strange to have the same attack mapped to jab and ftilt, but it certainly does fit MM's character.Pretty much my observations as well.
Though I would add, his Ftilt would be his buster shot once more, as the he mentioned in the Developer Direct that he can also shoot while walking.