It's story time!! Of the OMG-OMG-OMG variety!!
A Fair balance
Well...I don't quite know about this...
So this is the beginning...yea........... -_-
So the Sage had a brother, does that mean the Sage's Brother is the Hyuga's and Uzumaki Ancestor? Also does that mean the Younger Brother had the 9 tails sealed within him? The Brother's look so much stronger then Madara... and does that mean Madara having the whole Juubi = Stronger then the Sage?
A lot of people are gonna be pissed about the older son not having the "spiralgan" we thought he did, years ago. But holy hell! This is special though!
Let's not forget there's 3-4 stages of the Sharingan.
The other brother of the Sage is now is a mystery. What happen to him? Is he the Uzumaki, Hygua, Juugo's Clan ancestor?
I'm kind of disappointed Kishimoto went the whole reincarnation route. Wasn't being a descendant enough? Now we are left to wonder how Madara and Sasuke can possess the same soul in two different bodies, at the same time....
So the difference of the two brothers between chakra and body doesn't exist? You only born strong or weak
I wouldn't read that much into the whole "reincarnation" thing. Because the sage also said that the juubi was the "reincarnation of the holy tree", but that's hardly the case, in the literal sense. As far as I understand it, the juubi IS the tree, in a different form.
With that in mind, it could mean that Naruto is a descendant of the younger brother, like we've always known. In both body and soul, meaning, both body and will. Japanese can be really ambiguous at times, because it's a less specific language than our verbose English. It's all about context, so I'd wait for the mangastream translation to make up my mind about it.
Edit: The brother of the Sage was brought up for a reason, thinking about it we may well find that he was in Hasirama. That would explain his massive amount of power compared to even Madara. The younger brother needed to co-operate with the bijuu to match the power of his older brother, making it that Naruto was always going to need a Bijuu to fight on terms with Sasuke. In Madara's case he may well have tipped that balance by taking a Bijuu aswell as having his massive natural power. So to stop that you would need a power greater than the sons - enter Sage's brother.