Board Thread:Naruto Discussions/@comment-36221354-20180717114536/@comment-3568954-20180719083247

Elveonora, another possibility is That Momoshiki and Urashiki stole the Rinnegan. we know they gain power by consuming the chakra of others, so maybe they gathered up the residual chakra of Indra and Asura over there 1000 year battle and created Chakra medicine pills and gained access to the Rinnegan that way