Board Thread:Theories and Speculation/@comment-1872728-20160404064008/@comment-5936871-20160404200322

I don't think an Asura transmigrant can get Rinnegan unless they take an Indra transmigrant's eyes. Indra seems to need Asura's "body" to unite the whole "body" and "eyes" theme to unlock the Rinnegan while the Asura transmigrant would need the Indra transmigrant's "eyes" to unite the "eyes" with their "body" to get the Rinnegan. Madara's EMS evovled into a Rinnegan once he got Hashirama's cells. So Hashirama would have needed Madara's EMS in order to get the Rinnegan because he has no special eyes to evolve without it on his own.