We have seen therories come and go about the masked man, but there is something we all gotta keep in mind: There is no way that he is an Uchiha. As we all know he has a sharingan, and now a rinnegan, but the sharingan is always activated. He cannot turn it off, like Kakashi Hatake, and if I am not wrong members of the Uchiha clan can turn off their sharingans.
Because he can use the shringan and rinnegan must mean that the masked man is a member of a strong clan. The Senju or perhaps Uzumaki clan, both of these clans are known for their chakra. Danzo shimura managed to use all those sharingans on his right arm because of Hasirama Senjus cells, and all of the ninetails jinchuurikies have been members of the Uzumaki clan.
This theory may be old news, but it sounds possible right?
Because he can use the shringan and rinnegan must mean that the masked man is a member of a strong clan. The Senju or perhaps Uzumaki clan, both of these clans are known for their chakra. Danzo shimura managed to use all those sharingans on his right arm because of Hasirama Senjus cells, and all of the ninetails jinchuurikies have been members of the Uzumaki clan.
This theory may be old news, but it sounds possible right?