Yeah its not like you can do much about it that it contains little facts, because the manga just havent provided us with more than little facts. So to come up with a theory about it, one has to be creative with fantasy basically, which you did a good job at. However it makes it harder to believe in the theory coming true.Yeah sadly Manga gives us little to no info about Hyuuga and Uzumaki clans to theorize about it.
The point with noone among Hyuuga clan don't having red hair is tricky and main reason to debunk this theory as we speak now.
I believe it would be result of diluting blood leading to change their DNA a bit with both of the clans having other dominant features.
Well I just came up with new idea that one of Ootsutsuki woman do *** with descendant of Elder Son and Hyuuga could be in result.. why Uzumaki would do the same with Senjuu or no.
However as you said this theory as evry theory concerning Hyuuga clan is very incomplete and lacking a lot of important info sadly so it doesn't have strong base to begin with...
Anyway thank you very much for your input .
+ rep for you
EDIT: after I spread some rep first ;/
I dont think a person can have abilities like Uzumaki powers,
Byakugan and stuff like that without the fruit or the power of Juubi.
People didnt even use chakra before Kaguya ate the fruit.
I believe the Uzumaki and Byakugan powers are from the fruit, the Juubi, the sage, the elder/younger sons or their offspring. But going more into detail is hard.
There are so many things one can come up with, but it is really hard to find a good base with facts
to mix with predictions and some fantasy.
For some reason the Hyuuga protect the secrets of Byakugan and the Uchiha dont.
Hyuuga have the sun as theme and the Uchiha the moon.
That is interesting as well.
Edit, new part:
What if the Elder son's dojutsu was an improved Byakugan and not a sharingan.
Over the years, under influence of Juubi chakra, hatred and the likes, it turned in his or one of his offspring, into a sharingan. The Byakugan lost the improved form over the years and became the white eye we know.
Hyuuga are linked to the sun and Uchiha to the moon, so the byakugan falling to darkness and becomming a sharingan would make for a good story imo.
Meaning the first few members with sharingan, from which many years later, the Uchiha clan came into existence from, are fallen Hyuuga.
Maybe the sealing system is to stop the branch members from losing their byakugan, when their hatred towards the main family grows to strong.
I know this story contains not many facts either btw .
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