Hagoromo inherited Kaguya X Shinju fruit = Rinnegan. So basically he inherited all of her gifts and strenghts. Hamura
who is Hagoromo's brother only inherited his mother's eyes the byakugan. He is an offspring of what she was originally.
So he was basically the one who ended up on the shit end of the stick. Just like with Indra and Ashura one inherited
all the gifts and one ended up with poop. BUTTTTTT.
This would explain why the Hyuga are one of the four noble
clans of Konoha and why they would go so far as to put a curse mark on their own clansmen to guard the Hyuga
secrets. He was still kaguya's son and her secrets are his secret. Meaning if you learn how to defeat the byakugan
then you've learned how to defeat kaguya halfway. And that would also explain the location of
the Hyuga's Curse mark on their forehead. It is symbolic of because of the Sharingan.
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They were there ever since the beginning. Someone passed along kaguya's byakugan and that person was Hamura.
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The Uchiha Clans origins lie with the Hyuga Clan. If Hamura and Hagoromo had descendents then they would have sprouted around the same time. The Uchiha started with the Hagoromo and The Hyuga started with Hamura.
So basically the Uchiha and Hyuga are distant cousins. Which explains why some of the other manga's stated that
they were distant relatives.
Hamura Hyuga Everybody.:flowers