Board Thread:Naruto Discussions/@comment-3568954-20140625232535/@comment-5936871-20140626044417

When Hagoromo said his mother had the Byakugan and power of the Sharingan he simply meant that she had the Byakugan and the third eye which is a Rinnegan with the Sharingan powers. This can be proven by Madara who also had the same eye yet it was called a Rinnegan and Sasuke who also had the same eye yet it was called a Rinnegan in his case too. Especially since the Rinnegan came before the Sharingan (stated numerous times) and Kaguya is the mother of all dojutsu so clearly she had a Rinnegan too. Madara and Sasuke are also able to utilize Sharingan jutsu through the eye so that further reinforces the point.