The same can be said for Uchiha tho. But if that was the case why was only Nagato stated to be of Senju lineage only and not say Kushina Mito Karin etc? I believe his dad was a Senju or something.That Senju lineage bit could just be because he is an Uzumaki
we don't really know
the Uzumaki are from Ashura's family tree and we also know that the Senju and Uzumaki are related
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there are so many mysteries for the Uzumaki and sadly now we will never really know about them
Tho agreed kishimoto should have gave Uzumaki a bit more background.