First off, title, now some reasons why I believe this..
1. Uzumaki's Possess Strong Bodily forces
Ex:
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taking more pain then average human..
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still could protect naruto after going through childbirth AND an extraction...
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lived for at least 90+ years...
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took Chidori Spear head on, which chidori normally is an insta kill on average shinobis..
2.Uzumaki's Were Known for Sealing
Now, how do you expect some HUMAN to seal the FULL Juubi... And for the people saying he had rinnegan before Juubi, no. Juubi + Uzumaki: Rinnegan but I will get to that in a second...
3.Uzumaki+Juubi: Rinnegan
An uzumaki with the Juubi's DNA can form rinnegan..
Now...
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How does this work?
The So6p Split his BODY and his Eyes right.. he didn't have a spouse, he used Creation of All Things..
His eye powers originated from Juubi, Uchiha's are distant relatives to the Juubi as Senju to Uzumaki!
Where am I Getting at?
Senju + Uchiha: Rinnegan
Senju's are distantly related to Uzumaki as Uchiha for Juubi..
Comments, Questions? I'll take em. Just needed to say this..