SO6P was NOT uzumaki nor was he from any clan, no matter how good the theories people make, it all breaks down to how can the so6p be a shinobi when he is the origin of all shinobi's (he tought people the concept of chakra and how it works) so people did not know what chakra is until the so6p showed up. now people are obsessed with knowing WHERE did the so6p come from (HIS origin) but that information serves no purpose (useless) and since he was a god like and all then may be he simply came down from the heavens lol
and to say that he was simply an uzumaki means that you just made him a mere man, you just took everything he had and gave him only his sealling tecks witch are NOTHING NOTHING to the juubi (a destroyer of worlds).
the fact the he sealed and separated the juubi into pieces means that he was more than a shinobi (something waaaaaaaaaaaay bigger). uzumaki resembling the so6p doesn't mean that he was one of them, it simply means that they are descendants of the so6p.
There is enough backup material in the manga, to believe the sage was an Uzumaki.
Clans or Shinobi, dont need to exist in order for the Uzumaki to exist. They were just assembled under a different name than clan.
The sage was an Uzumaki.
Lets see:
We are not allowed to see his hair, when he is still young and hasnt split up the Juubi or created the 9 bijou.
Hmm, maybe cause it's red?
We are allowed to see his hair when he did this (its white or at least light color).
Probably turned white after using up his powers to much, just like Nagato.
He possessed sealing weapons and sealing jutsus.
He was able to seal the Juubi inside him,
be the Juubi's host,
extract the Juubi out of himself AND survive this.
What type of person is known for these type of feats?
Yup an Uzumaki.
It doenst matter if they were called a clan or not back than.
They can still exist.
The Juubi does not have feelings or ideals, so this is not a being full of hatred that went on a rampage.
I am not saying it just rolled over vs the sage, but this battle (if you can call it that) was something unique (a battle, where at least one of the parties, lacks feelings). Making it possible imo, that an Uzumaki, managed to become the Juubi his host and doing all of this by himself.
Kinkaku and Ginkaku are said to be related to the sage as well. They survived 2 weeks in Kurama his stomache and fed of his flesh. Others tried to eat the Hachibi's flesh, and they died. Almost noone can wield the sealing weapons that Kinkaku and Ginkaku used. You need to be special for that and have monster chakra reserves (Tenten and Darui ran out of chakra very fast). By coincedence (lol, yeah right) we are not allowed to see Kinkaku and Ginkaku their eyebrows (the shinobiheadband covers it) and we cant see their haircolor either (headress covers it). I can tell you why, because the eyebrows and hair are red.
and now history is repeating itself.
Naruto, an Uzumaki, is standing in front of the Juubi.
Why make Naruto an Uzumaki if they are of less importance than the Senju? Why bring Uzumaki specifically from another village to Konoha, to host Kurama. Why not Senju? Naruto could have been made a Senju instead, but that didnt happen. I'll tell you why, because the sage was an Uzumaki. The sage predicted someone would led them to the right path and all the bijou knew this person has to be Naruto.
Naruto doesnt have that seal that Kurama recognized for nothing either.
It made Kurama remember of the sage and so it happens, that seal is an Uzumaki seal.
The sage was an Uzumaki.