Board Thread:Naruto Discussions/@comment-3232093-20140617193601/@comment-4271790-20140818205657

Ten Tailed Fox wrote: Reread windstar. Marara said that the third eye could only appear in those who have the Rinnegan based on what Black Zetsu wrote on the tablet. Kaguya was no special case, as how else would Zetsu, Kaguya's will, know that. Kaguya is a special case because she ate the chakra fruit and got unrivalled power. It was her third eye. She never had the dual Rinnegan that Hagoromo had (that's where her Byakugan were). To awaken her third eye, one need the power of the "Samsara," which is the Hagoromo's Rinnegan. But Hagomoro got his power from her. Those rules apply to a regular person, but not Kaguya, who ate the fruit and was the first to awaken that third eye. That's why she's a "special case." Her third eye is a Rinnegan as well.