Board Thread:Episode Discussions/@comment-25319479-20180614110007/@comment-5311048-20180614233744

Natrix Spiritual Cloak Gleam wrote: It explicitly, was stated, Indra's Genes are compatible with Ocular-Powers. Combining Chakras(Indra/Asura) is one thing, placing the Combined-Chakra, in an appriopriate vessel (Transmigrated Indra) is another, likely. No one said you'd need Indra's Genes. Hagoromo only said both of Indra and Asura chakra to awaken the rinnegan. Incarnations could have happened without it being a Uchiha. Unless it is stated otherwise without a sense of "Hypothesis" that you need the Sharingan, then both sons Chakra. All that it is known, is that you need to be the sage of six path, needing Indra and Asura's chakra. Which can only be obtained by little means.