OP, you are wrong for several different reason.
1 - Uzumaki are descendants of Ashura Otsutsuki. The manga even tells us they are in the same lineage as Senju. The manga never tells us how they can to be. So Uzumaki could just be the name for Senju members who no longer participates in the battle against the Uchiha.
2 - Naruto huge amount of chakra doesn’t come from the nine tails. Kishi told us that in the manga. The official translation says the 4th Hokage designed the seal so only a little bit of the 9 tails chakra leaks out from the seal and he hoped it would combined with Naruto's chakra. There's no guarantee that the little bit of chakra would combine with Naruto's chakra.
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3 - Creating and maintaining shadow clones require skills. During the first bell test Naruto could only make 8 clones and maintain them for about a minute -
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When Naruto was first fighting Garaa he was only creating a few shadow clones at a time -
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It wasn't until Naruto became better at gathering, controlling and releasing his chakra that he was able to create 1,000 shadow clones -
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to
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