Indeed. I mean, by the logic that "If it doesn't have a number then it's a side game" then Kingdom Hearts must be a side-game since it doesn't even have a number on it. -_-
Very good logic. Honestly, Nomura HIMSELF said that Birth By Sleep is a MAIN GAME, so why are people still arguing about it? no matter what you say, you can't change the fact that BbS is, in fact, a main game.