Board Thread:Naruto Discussions/@comment-34436445-20180703141210/@comment-31099706-20180704173927

Thekillman wrote: Apparently having a double Rinnegan lets you have a Rinne Sharingan. Seems that Hagoromo decided to err on the side of caution and prevent that with Sasuke. Maybe, but from what shown by Madara going after Sasuke's Rinnegen to complete the pair, shows that all one would need be is another Rinnegen. And at that time, there were two, so The Sage probably didn't think it through or something.