Board Thread:Rebirth: Applications/@comment-8914761-20141108005550/@comment-4869113-20141108155012

"It appears in a few select members of the Tsuyosa Clan (つよさ一族, Lit Family of Strength). They only chosen members are those who inherit the golden chakra as well as vast physical energy, with immense reserves of chakra. Their large portions of physical energy give assumption that this clan has lineage connected to the Senju clan."

And then you have the Senju clan part right there. Why not just app for a senju with the eight gates.