Board Thread:Theories and Speculation/@comment-29769110-20161017201027/@comment-734582-20170911112253

Ashwin Anand Ilangovan wrote: A Rinnegan, as stated, can be manifested only if one possesses a Sharingan and has obtained Hagoromo's chakra(Indra's and Ashura's chakra). Nope. It's enough to have Hagoromo's chakra, a Sharingan isn't needed. Kabuto didn't account for sample bias. Black Zetsu, who we can consider the greatest authority here, made his statements about the Rinnegan in a completely neutral way. The Uchiha are just easier to manipulate into creating a feud.

Though just for completionism, Hagoromo fully embraced the body/eyes divide, as he already stated he didn't like one person having all the power.