Board Thread:Theories and Speculation/@comment-32369776-20170708034118/@comment-24824859-20170715141444

Thekillman wrote: I don't think this is necessarily true. It appears that the Senju and Uchiha simply were the guardians of their forefather's ideology (will of fire versus Uchiha's might makes right) in addition to their genes. The Uzumaki appear to be genetically and ideologically related but not part of that very core group.

Though to be clear, i don't think the clans formed immediately after Asura's and Indra's demise. But somewhere within that century or so, it appears their followers formed these clans. That still doesn't change that there was possibily of a split much later after the founding of the Senjus. Whatever the case may be, the Uzumakis were originally part of the Senjus then later split