Yin-yang release

We know the sage had all 5 element types but where did ying yang come from?

Quote :

Jubi Is the primordial entity tied to the legend of the Sage of the Six Paths. Its chakra was divided into the nine tailed beasts and its body sealed into what would become known as the moon,by the Sage in his final moments of life. The Ten-Tails is considered to be the creator of the world, and the herald to its end should it ever be revived.

The juubi help held Ying,Yang & Ying-Yang Release
Ying= Spiritual (Imagination) Yang=Physical Energy (Vitality)

When you add Spiritual+Physical Energy= Life

That's how the juubi became the earth creator and how did the sage obtain such power? When he sealed the juubi inside himself the rinnegan copied his abilities forming them into release

The sages sons are creations of Ying-Yang release A.K.A Creation of all things

From what I thought is the brothers have ying and yang........but that's not the case

The elder brother had ying-yang While his brother has yang release

I got this by the fact the eldest son of the sage had a pure dojustu and a corrupted dojustu
(PURE=Byakugan Corrupted=Sharingan)

With the corruption. In the eldest brother he became just ying

There is another theory I have about the moon!

We know the moon has a darkside and as a pure side its very possiable the moon itself is ying-yang because madara plain needs to reflect why not off the releases that create genjustu itself

The tailed beast also are creation of creation of. All things that the sage gotten from the ten-tails
Like kurama has both yang and ying. But also they are imagination but also life and hold life to the juubi even just a small chakra from them to juubi could bring him to life