Board Thread:Naruto Discussions/@comment-24860855-20140430042530/@comment-5909893-20140808022246

Since Kaguya apparently has the Byakugan, and Hagoromo doesn't, then it was probably passed down to his brother, who's of equal strength to Hagoromo if I read the manga correct. Hagoromo was probably just named as 'The Sage of the Six Paths' because he had a greater impact on the ninja world, going around and passing around his Ninshu. And also, althought Kaguya has the Byakugan, she hasn't shown much use of it yet, and I for one don't see her participating in close combat/taijutsu. Based on that, I think it probably has some other use.