I believe that Kaguya is connected to the Hyuga. The reason I think that she is connected to the Hyuuga is how secretive the Hyuga are and how the main branch are treated with loyalty, to the point where nothing is more important than the survival of their heir.
Same as one would do with a royal family and the heir to their throne, note that Kaguya herself was noted to be like a goddess or a princess in many ways. So, the Hyuga likely draw their origins from these Ototsuki Warriors, of whom remained behind to stand watch over Kaguya's 'grave.'
Let's not forget that it's been mentioned a few times about how the Hyuga seal their eyes to protect the "secrets of the byakugan". It's easy to dismiss this as merely meaning to prevent them from being stolen, however it's just as easy to say there's something more to the byakugan.
Kaguya, apparently had the Byakugan - and it has been indicated that there are more of people like Kaguya out there. Before she ate the fruit, her natural eyes is her Byakugan. We know Every child of the Hyūga has those 'white eyes' since its birth. Therefore, the Byakugan has probably a different origin which imo is connected to Kaguya Ōtsutsuki. I don't think it comes from the Juubi AKA the fruit.
We know that Kaguya appeared to eat the fruit and obtain power, thus corrupted her and awakened her Third Eye and people began to fear her.
I think Kaguya is aiming to launch an attack on the realm of the Gods or maybe the afterlife to gain something she wants. It may be that she sees this as her destiny, which would give another link to the Hyuga and their teaching of destinies.
The purpose of the Curse Seal is to prevent the rise of another Kaguya, and quite possibly to seal off branch members from greater abilities likely developed as a means of keeping the broader population of Hyuuga from being able to seek broader power as Kaguya did
This would ties in to the Hamura theory that I found in reddit:
Hamuras Legacy
ALSO, Kishi did say there will be Hyuuga development soon. Why does this have to simply be Neji dying? This perhaps why Neji dies so that Hinata is the only Hyuga left in the Konoha group so she can take some kind of pivotal role on.
Although there are some signs of Neji make his comeback which was foreshadowed by Hinata which could lead to my theory I've made before.
Same as one would do with a royal family and the heir to their throne, note that Kaguya herself was noted to be like a goddess or a princess in many ways. So, the Hyuga likely draw their origins from these Ototsuki Warriors, of whom remained behind to stand watch over Kaguya's 'grave.'
Let's not forget that it's been mentioned a few times about how the Hyuga seal their eyes to protect the "secrets of the byakugan". It's easy to dismiss this as merely meaning to prevent them from being stolen, however it's just as easy to say there's something more to the byakugan.
Kaguya, apparently had the Byakugan - and it has been indicated that there are more of people like Kaguya out there. Before she ate the fruit, her natural eyes is her Byakugan. We know Every child of the Hyūga has those 'white eyes' since its birth. Therefore, the Byakugan has probably a different origin which imo is connected to Kaguya Ōtsutsuki. I don't think it comes from the Juubi AKA the fruit.
We know that Kaguya appeared to eat the fruit and obtain power, thus corrupted her and awakened her Third Eye and people began to fear her.
I think Kaguya is aiming to launch an attack on the realm of the Gods or maybe the afterlife to gain something she wants. It may be that she sees this as her destiny, which would give another link to the Hyuga and their teaching of destinies.
The purpose of the Curse Seal is to prevent the rise of another Kaguya, and quite possibly to seal off branch members from greater abilities likely developed as a means of keeping the broader population of Hyuuga from being able to seek broader power as Kaguya did
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This would ties in to the Hamura theory that I found in reddit:
Hamuras Legacy
Hamura was born with the byakugan. Like his brother and mother before him Hamura had two sons, twins. However he finds himself in a dilemma. Having knowledge of what transpired between Indra and Ashura he was concerned that his children would fight for power as well. Therefore, Hamura decided to place a seal on the child he believed was not worthy to be his heir. If this child were ever to grow jealous as Indra did the seal could be activated to stop the child from resorting to violence. However, Hamura's heir decided to use the seal as a way to subjugate his sibling, forcing him into a life of servitude. The heir would then place seals on his brothers children as well so that they can serve any children that he would have in turn. Thus the Hyuga clan and the main/branch system was born.
ALSO, Kishi did say there will be Hyuuga development soon. Why does this have to simply be Neji dying? This perhaps why Neji dies so that Hinata is the only Hyuga left in the Konoha group so she can take some kind of pivotal role on.
Although there are some signs of Neji make his comeback which was foreshadowed by Hinata which could lead to my theory I've made before.
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