Board Thread:Theories and Speculation/@comment-1872728-20160229033316/@comment-3965545-20160302025711

Genetics. That's why it matters. Uzumaki have long since been implied to be special altogether, while only Hashirama(incarnate, wood release, Sage Mode) and Tobirama(incredible sensor, very high reserves, creationist of shinobi techs) were special in the Senju clan. At base level minus any special characteristics, the Uzumaki = the Senju. I like the idea. But there is no factual info to cement it.