If the brother of Sage Of Six Paths is the ancestor of the Hyuuga and Uzumaki clan . What would his prowess be ? Like think about , if the brother gave the power of excellent chakara control , great chakara storage , longevity of life , and the byakugan eyes . What was his power ? I think his power was just the strength of the juubi . Sage Of Six Paths got the eyes and the other brother got the body . In the strength prowess , what was his justus ? What techniques did he use ?
I say the same. This is Kishimoto's Manga we are talking here. *Peter from Family Guy voice* It is some variations of the same Jutsu or repeat, but on a bigger scale. :|
Notice that the Juubi's Eye and head are tilted and fixated towards the brother and not Hagoromo? it is because he is the one performing the sealing ritual:
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Take a look at the ropes on the stones:
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The rope is called a Shimenawa and the Paper Strips (Triangles) are called Shide. When a Shimenawa is tied around any naturally existing object to convert it into a Shrine and invite spritual entities (God, Good luck, Spirits etc). This object is called Yorishiro. But, if the Yoroshiro is a person (medium) that person is called a Yorimashi, if a divinity possesses the individual it is called Kamigakari.
Kamigakari is the precursor of Kagura, the mask ritual dance that gives honor to the Kamis:
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Possession of the Death God when wearing the Mask.
Also, Hagoromo's brother staff is a Tetsukō:
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It is utilized in Japanese rituals of exorcism by shamans and priests, which in this Manga's case, is sealing/fuuinjutsu
He isn't related to the Uzumaki, the Uzumaki are a pointless fodder clan, No one cares about the Uzumaki except naruto fanboys who want to turn him into the Sage, even though that theory has been throughly Killed.