A random thought. Now that we know that Hashi's personality is really silly and goofy maybe tobi was the white zetsu clone just like the black zetsu is madaras will and personality. it makes sense.
Yes im quite up to dte with the manga, however, i highly doubt that obito would act like that on his own. Its true he has parts of white zetsu in him so perhaps that was *silly* i never said the name obito alone, i said *silly* there is a difference.