Ah I see at least what he's trying there, but it's unnecessary (and stupid). Majin Buu IS at least a relative glass cannon (though he still straight tanks attacks occasionally), that much can't be denied. The obvious issue with SB's logic, is that this doesn't magically make the rest of the cast glass cannons. In fact most of them can be clearly demonstrated to NOT be glass cannons. It'd be like using 02 Cherubimon to say all Digimon (at least Adventure ones) are glass cannons. He himself definitely is one, given he can one shot Holydramon and Seraphimon with a double-axe handle yet their weaker forms could severely damage him, but that doesn't make other Digimon (who blatantly can tank attacks from others on their level) suddenly glass cannons.