Use some logic, Uzumaki are Ashura's descendants hence why Nagato was said to be related to Senju, technically Kushina and Karin are also Senju.Rek'd. Like I said he chose Nagato because other than Madara he was the only one able to summon the Mazo and of Senju lineage.
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Wow you're dense.
But there's a clear difference between both lineages and Nagato is from the Uzumaki lineage, there's no debate about that. BZ's statement was just a way to confirm Naruto's clan having the same origin as Hashirama's clan.
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