Board Thread:Naruto Discussions/@comment-25442710-20140920121351/@comment-25343176-20140922151230

for an ashura reincarnate to have rinnegan they must transplant it. They already have the body or eyes of the sage. The only way for reincarnates to awaken its full extent is six paths chakra aka mixing indra and ashura's chakra. The full extent of the sage's body is six path sage technique i think.