No way it can be Izuna unless the Zetsu material helped him gain long life. It ain't no damn Obito. The Sages son would be stronger than Uchiha Madara. No way he would punk out to him. He would have the strongest genes closest to the Sage himself. Kagami I believe is dead. Sasuke dad is dead. It's gotta be a remnant of Madara that he created.
I really want him to be no one. The Tobi I know and love is a mystery. If I had it my way Tobi would be killed with out knowing who was ever really under the mask.
i want tobi to be A Geneticaly modified uchiha created by madara to continue his plans.A man that goes by the name tobi and trolls everyone into thinking he is long dead,irrelevant characters that already have served their purpouse.