Board Thread:Theories and Speculation/@comment-27924662-20161219053341/@comment-25122992-20161219093141

I`m completely sure that Juubi is necessary here as well. Otherwise, there was no need of becoming a TTJ to cast the IT on the world. Since Juubi possesses the Rinne Sharingan, it's only natural for its Jinchuriki to awaken it as well.

P.S. Oops, I read "Naruto" instead of "Nagato", by bad