Thanks, also, take note of the Gold and Silver brothers:
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Raikage said that they have a connection with Rikudou Sennin.
The Gold and Silver brothers are the only ones outside (assumed outside at least) of the Uzumaki lineage to become successful Jinchuurikis of Kurama (albeit incomplete pseudo-jinchuurikis because they only ate the flesh of Kurama not seal it inside them) the Uzumakis were the only ones capable of being Kurama's host, they were imported from the Uzumaki village just to become Kurama's Jinchuuriki (eg. Kushina) meaning they are the only suitable host for the Kyuubi, but the Gold and Silver Brothers were also compatible Jinchuurikis, if indeed the Gold and Silver bros were related to the Sage and if they are capable of becoming the Kyuubi's host like the Uzumakis were, then it is logical to conclude that Rikudou himself must also have been an Uzumaki.
And also the brothers look like the Shinigami of the Uzumaki's Shikii Fuujin xd
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