to give hyuga an origin
I still believe in what I said
Byakugan is the human eye/body mutated to be compatible with chakra. Because before that humans body did not contain a single drop of chakra, you cant jut contain a massive amount of chakra with the fragile body of humans, therefore it had to mutate, the eyes and the body.Just look at byakugan, its all about chakra, emitting chakra from the body, seeing chakra, cutting chakra, using chakra as weapon and defense etc..clearly it is the eye of chakra.
when im sure at my theory, there usually is some truth in it