So it's already been established that The senju came from the Younger son and The Uchiha from the Older son.
The Older son inherited the eyes,powerful chakra,and spiritual energy(which is yin chakra)
which resulted in his eyes,the first mutation of the rinnegan without yang chakra,the swirl may symbolize mind control/genjutsu.
When an uchiha awakens their mangekyou sharingan their chakra's start to resemble genjutsu as stated by Atsui
genjutsu is the yin element or utilizes yin chakra
the chapter titled The power of Darkness
Yin symbolizes cold,darkness,the moon, and evil. in the yin/yang symbol it is black
Tobirama said when a uchiha suffers a loss special chakra will release in their brain producing a change in their eyes
The chapter title A Clan Possessed by Evil
This is most likely yin chakra because of their relation to the older son.
If you look at the picture of the sage he has in hands yin chakra and yang chakra,the yang chakra is the lighter one
Naruto only has Kurama's yang chakra, and assuming he has the same seal as the sage,his seal should be filled up with yang chakra
if you look at the guy in the middle of the Juubi's mouth he has a swirl looking thing which is yang chakra
It's also on the wall behind Sasuke
and it's on Hinata's jacket
Yang symbolizes good,light,the sun and in the yin/yang symbol it's white
Hyuga means towards the sun and Byakugan means white eye
so i think in the time the elder son's blood and chakra was thinning one of his descendants got more yang chakra and it mutated their eyes into byakugan while the uchiha kept his yin chakra and their power up makes them more like that.
pretty much the eyes+yang chakra=byakugan while the eyes+yin chakra=sharingan and it's variants
and this is what was meant that the origins of the uchiha clan lie within the hyuga clan
and why kakashi thought the rinnegan was a mutation because he probably realized sharingan uses yin chakra while byakugan uses yang chakra and that the rinnegan was both
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which resulted in his eyes,the first mutation of the rinnegan without yang chakra,the swirl may symbolize mind control/genjutsu.
When an uchiha awakens their mangekyou sharingan their chakra's start to resemble genjutsu as stated by Atsui
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the chapter titled The power of Darkness
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Tobirama said when a uchiha suffers a loss special chakra will release in their brain producing a change in their eyes
The chapter title A Clan Possessed by Evil
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If you look at the picture of the sage he has in hands yin chakra and yang chakra,the yang chakra is the lighter one
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if you look at the guy in the middle of the Juubi's mouth he has a swirl looking thing which is yang chakra
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Hyuga means towards the sun and Byakugan means white eye
so i think in the time the elder son's blood and chakra was thinning one of his descendants got more yang chakra and it mutated their eyes into byakugan while the uchiha kept his yin chakra and their power up makes them more like that.
pretty much the eyes+yang chakra=byakugan while the eyes+yin chakra=sharingan and it's variants
and this is what was meant that the origins of the uchiha clan lie within the hyuga clan
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