The Rikudou Sennin was not a "creation" he was very much a human being, who became a god after sealing the Juubi inside himself, it is called "Apotheosis" the transcendance from human to divine, the two sons of the Sage were made from the Juubi's essence inside him with Banbutsu Sozo.
And a clan is not limited to a shinobi clan but a family aka a progenitor clan which later became the modern-era Shinobi clans of Narutoverse, the misconception of many was that Rikudou was the "first human" like Adam which is not the case, the era of Rikudou is, according to Jiraiya, a time of endless war and strife, clans most definitely existed back then who were fighting and warring albeit non-ninjutsu wielders. These pre-ninjutsu clans were the ancestors of the modern-day Shinobi Clans. Take a look at the history of real-life Shinobis in Japan, the Iga and Koga Clans were once just bandits/mercenaries and sellswords but later they became the organized and formal Shinobi Clans from which they were remembered for ever since.
I had just said that Rikudo was not a creation but you go ahead and state the exact same thing. What's your point?
In bold: you're incredibly stubborn. You keep assuming that your theory has already been proven correct, when it hasn't. No,
the sons are not his "creation", they are people to whom he passed on his powers. Similar things have happened in the series like Madara passing his powers on to Nagato.
I don't see why you waste so much effort trying to defend that idea, when even if it were true it would still have nothing to do with Rikudo being a Uzumaki or not.
No, no one here assumes that Rikudo was the first human. No one here assumes that "clans" didn't exist before. But he is the creator of ninjutsu. Shinobi clans did not exist before him. There were no Nara, no Uchiha, no Hyuga, no Sarutobi... no Uzumaki.
All these kekke-genkai, ninjutsu are due to the Sage making it possible for regular people to master a small portion of the Juubi's power: the mastery of chakra, through his sons and the many people they have interacted with.
Some other guy, ironically defending you, said that Senju and Uchiha didn't exist in the first generations... well of course they didn't, those two are already specialized clans, those that were the most directly descended from the two sons. Same goes for the Uzumaki, son.
