Juubi jinchuuriki and The Rinnegan
Naruto and Sasuke represent The older and Younger son
The Older son didn't have The Rinnegan because he didn't inherit the Sage's Yang chakra, he has some kind of swirl pattern. Probably some kind of Eternal Mangekyou Sharingan with his own patter
The Younger son had the body and yang chakra to handle the Juubi but the Sage split the Juubi and scattered them across the world.
Over time both of their blood thinned
In order for a uchiha to overcome the thinning blood he would have to get his own Ms and and another member of the clan's Ms and combine it. Doubling the Yin energy as well.
When sasuke first used his Susano'o C thought it his chakra resembled genjutsu.
genjutsu is the Yin element
Naruto is an uzumaki and kushina's son who is known for having incredible life-force(yang chakra)
and Minato sealed the Yang chakra into naruto boosting his yang chakra up even more, now he has flame-looking chakra like the Younger son.
The Sage of The Six Path did 3 things on his death bed.
1.Choose a successor, The younger son because of his thought of finding peace through love
2. Divide the Tailed beasts. (Notice the chakra around the sage)
3. Make a prophecy
He choose the younger son to be his successor because of his ideal of peace through love.
Naruto is friends with all the bijuu now, they also believe he is the one the sages were talking about.
Naruto most likely has the seal that's being quietly passed down.
The bijuu probably gave him their chakra because it probably has something to do with the seal.
The pattern on the ground around the Sage has two circles
which resembles naruto's seal when he uses bijuu mode
and the aura around naruto looks like tomoes, 9 to be exact.
Don't forget that Naruto knows their name so when the Juubi is revived, he will probably call out their names and they will fight inside the Juubi's conscious and remember Naruto, and Naruto will seal them.
Sasuke will most likely get the Rinnegan.
Orochimaru knows about the Rinnegan and that's why he's after Sasuke's body.
Him and Kabuto made a hypothesis about what the Uchiha tablet had on it.
which is the secrets of Madara's body. Madara has both uchiha and senju dna,
a fragment of the Sage's power. They also knew that he got the rinnegan. if you read the tablet with an EMS, it will probably tell you the next step to getting the Rinnegan.
when orochimaru got caught by Hiruzen he said he wanted to obtain every jutsu and truth
So when Orochimaru went back to Konoha to get Sasuke, Hiruzen guessed he was after Sasuke before Anko told him.
Orochimaru already had the First's dna.
So how to get rinnegan is the power that's in the scroll.Something only Orochimaru can do.
Sasuke is going to make Orochimaru do what Orochimaru was going to do if he took over Sasuke's body. Get the rinnegan.
The epic fight between Sasuke and Naruto is going to be god-like they will be stronger than both the older and younger son.
Sasuke could use all elements
Naruto might be able to use all elements the same way Son Goku enabled Roshi to use Lava release.
If Naruto doesn't get all the elements, he would probably be able to use all the jinchuuriki's unique techniques