Can any of you imagine Obito (no mask) picking fights with Deidara and doing silly stuff like good ol' Tobi did? I for one can't see him doing any of that without his orange mask...
I mean was it Spiral Zetsu who did the "goofy" parts or was it just Obito acting. If it was Spiral Zetsu then how was it possible for him to fit under his clothes? XD