Board Thread:Naruto Discussions/@comment-142748-20150403221647

Bringing my discussion here. I think that the manga inferred the only way for a Uchiha or Sharingan user to achieve the Complete Body - Susanoo is with the Eternal Mangekyo Sharingan or Six Path Chakra to enhance the Mangekyo Sharingan. It seems like the Mangekyo Sharingan alone is unable to bring out this form of Susanoo, given how Sasuke with the Mangekyo Sharingan could only bring out the armored form without legs, same with Itachi. With Indra, he's Hagoromo's son just like Asura, so its highly likely they had both inherited Hagoromo's Six Path chakra, and Kakashi inferred he only had the Complete Body - Susanoo from receiving Obito's Six Path Chakra (which is shown through the Kamui Raikiri, which is black instead of white). 