Board Thread:Naruto: The Last Discussion/@comment-732150-20150205151208/@comment-1512913-20150210154113

That's untrue. The Huyga almost certainly came from a human woman, while Hamura's Otsutsuki descendants were conceived most likely with a female of his own kind, unless you think he took the human woman to the moon (alien abduction!!!). So the first Hyuga and Hamura's Otsutsuki child weren't twins, therefore the Hyuga weren't main while the latter branch.

Toneri is most likely the same situation as Neji, he had a father who was born as second in the main family thus became the branch family.