Board Thread:Theories and Speculation/@comment-26320293-20150820185509/@comment-26320293-20150821144735

Seelentau wrote: The databook says so. Thanks that means that Hamura's descendants are not the only wielders of Byakugan. It also explain why Kaguya didn't get the Tenseigan since she is not the first one to awaken Byakugan, her eyes are probably not the strongest.