Hyuga clan is weird, and I'm here to tell you some theories about how they work (maybe).
(Please correct me if I'm wrong somewhere.)
About Hiashi — Hizashi:
Hizashi, the second child, was sealed while his niece Hanabi, who also a second child, was not. I think there are 4 possible cases here.
The Hyuga considered twins as bad omens, like every superstitious people in the past. They sealed Hizashi, because Hiashi was the eldest son and he became their heir by default. If they were normal siblings, Hizashi would be a member of the main family.
The Hyuga wanted to avoid conflict and fraud. Hiashi and Hizashi are identical twins, if Hizashi wanted to be the leader, he would kill Hiashi and pretend to be his brother, everybody could be trapped easily. If they were normal siblings, Hizashi would be a member of the main family.
Hiashi just became a better person (better than his elders, at least). He saw how much his brother and nephew had to suffer, so he protected Hanabi at all cost and luckily, he succeed.
Hinata was too weak when Hanabi was born, so they wanted to wait until she improved. If she couldn't, they would choose a new heir. Hinata was lucky enough, or the Hyuga don't want to seal a member of the main family, she's still a lady.
About how the main family still have so many members:
They've had many members from the beginning and just remained that number until now. They can get married with their relatives in the branch family so they wouldn't need to worry about population decline.
Every child was born in the main would be kept in the main family, whether they are the oldest or not. Only twins (or identical twins) had to be separated.
The Hyuga was normal in the past, until something wrong happened, then they had to separate and practice the seal.
About the Hyuga in Boruto:
All of their conflict were finished off-screen, thanks to Neji Naruto's impacts or some mind changing things after the 4th war.
Some of their conflict still exist, but not serious like in Naruto, the Hyuga just became more comfortable people.
Kishimoto literally forgot they're a large ninja clan, not a normal family, and didn't let them appear much, though they're also Hamura's descendants like Boruto and Himawari.
"Forgotten and wasted so much potential" ahh clan.
I wish I could know more and more about the Hyuga, they have been my favorite clan from the beginning. Guess I have something about loving the flop things 😮💨
Thank you for come to my ted talk 🫶

















