In order for a ninja to become a Sage one must posses a Rinnegan which is the strongest among the 3 dojùtsu's, and this is a combination of the Sharingan (from the Uchiha Clan) and the Baykugan (from the Hyùka Clan) and a marriage from these clan was forbidden because the child would poses extreme power, not long after the 3rd Shinobi World War the Uchiha's and the Uzumaki Clan, so many people of this clan were dead that the war had to be stopped. Minato was an Uzumaki and thought he wasnt because there was no Uzumaki around him and there was Kushima his beloved sweetheart and not knowing their marriage was forbidden they got married and had a child, how could such child survive such power, and being a Jinchuùriki of the Nine Tails, there must be some truths behind these

closed as unclear what you're asking by кяαzєя Sep 3 '15 at 20:44

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    Yo, guys, what's with the downvotes? Maybe comment on how you think this question could be made better? – Hakase Apr 19 '14 at 19:37
  • If you watched the arc where Kushina was telling Naruto about his parents' story she mentions that she was chosen next for the 9 tails even though she was young, because she had a unique abundance of chakra. It's also because their clan wasn't only known for their sealing jutsu but also for their longevity. Source: I'm just watching the series now but I also research from time to time. It's from episodes 248-250. Thus why Naruto survived all this as well as the tetragram seal, it gives only a small amount of the 9 tails chakra thus not killing him. – user11595 Feb 6 '15 at 17:05
  • This question makes a lot of opinionated assumptions without citing any sources. Furthermore the title and body don't correspond to each other. Please take some time to review and edit your question to focus on what you wish to have answered. – кяαzєя Sep 3 '15 at 20:44

There seems to be a lot of wrong information in the question you posted.

In order for a ninja to become a Sage one must posses a Rinnegan

To be a sage you need to master Senjutsu. Ninjas that have mastered senjutsu are Naruto, Jiraya, Kabuto, Hashirama, Sasuke (With the help of Jugo).

To have powers similar to the Sage of the Six Paths, one would need to have the Rinnegan and the Chakra of the Tailed Beasts.

To read more on how the Rinnegan can be activated you can read here.

combination of the Sharingan (from the Uchiha Clan) and the Baykugan (from the Hyùka Clan)

It has not been explicitly mentioned that Rinnegan was a combination of Sharingan and the Byakugan. It was shown that the mother of the Sage of the Six paths had the Byakugan, but that does not imply that the Rinnegan was a combination of the Sharingan and the Byakugan. Infact, to activate the Rinnegan, you don't need to have a byakugan.

marriage from these clan was forbidden because the child would poses extreme power

I don't remember reading anything that specifies that marriage among the uchiha and the hyugaa was forbidden. If you could maybe provide some references then I could elaborate on it.

Minato was an Uzumaki

No, Minato did not belong to the Uzumaki clan. It was Kushina that belonged to the Uzumaki Clan. Other ninjas that have been shown to belong to the Uzumaki clan are:

Karin, Nagato, Kushina Uzumaki, Mito Uzumaki, Naruto Uzumaki

The Third Shinobi War was not fought among the Uchiha and the Uzumaki.

The Third Shinobi World War (第三次忍界大戦, Daisanji Ninkai Taisen) is the third of the four shinobi wars that involved the majority of the shinobi villages. It takes place more than ten years prior to the beginning of the series and has been rarely shown in the series outside the Kakashi Gaiden. Because of a decline in national power, the reign of the Five Great Countries was crumbling. Along their borders, skirmishes with smaller nations broke out all the time. The prolonged war gradually spread its fires far and wide, until at last it developed into the Third Shinobi World War. This war turned into an unprecedented war of attrition, tormenting all nations with a shortage of war potential. Not even excluding a great power like Konoha, very young children were thrown unto the battlefield, losing their short lives.1

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