Board Thread:Theories and Speculation/@comment-28819877-20170515143845/@comment-734582-20170516183348

BlazeRelease wrote: I don't know why he would give one eye for rinnegen? it seems weird. Considering Madara's actions and words, One rinnegan would prevent Sasuke from ever casting IT, since Madara needed both to "possess the power of Rinne and approach the moon". So in the event that Sasuke won and wanted to plunge the world in darkness, he would never be able to cast (and presumably, control) Infinite Tsukuyome to recreate Kaguya.

BlazeRelease wrote: While I think it's more if the awakening that matters rather than the time? I've been trying to think of a nice connection or some core rule, but i'm not sure if we can deduce one. It seems to me though that exposure is the key. Madara only had a tiny bit of Hashirama flesh, so it probably took a lot of time to grow it and to control it. I don't think death has anything to do with it. The Unique power theme of the Rinnegan seems to grant the user what they lack (Madara: ability to call upon allies, Sasuke: Ability to put him in another's shoes). Alternatively, Madara dreamt of (protecting) family whereas Sasuke dreamt of what happened if he had switched places with Naruto.

BlazeRelease wrote: We can also not say that the Sage was the only one to have the power because Momo had it too. Momoshiki is a fairly strange case. But we also know nothing of the origin and extent of his power or the exact abilities of his red rinnegan, so i don't see any useful information to obtain or glean for him. As far as i know, he's irrelevant when it comes to deducing information.

Well, there's one tiny thing: his Red Rinnegan have a unique power each, which fulfill his dream of power without effort. The Purple Rinnegan has a strong theme of death, including the power over the soul. I think Momoshiki lacked that power and showed the true face of the Rinnegan, namely that it's a dojutsu similar to the Mangekyou (but rather than power of analysis, it grants power over chakra), while the purple comes from Six Paths chakra (which can be considered the power over death, seeing as how the origin of chakra is from a murdering life-sucking tree).

BlazeRelease wrote: And we can't always be right about other's gaining rinnegen. Since Obito had both Rinnegen(already Sage's chakra) and zetsu/hashirama cells with him, for more than weeks. and I think he did know how Madara awakened his rinnegen, so him not even at a saying he could would mean that it's not possibke for even him? Maybe it's just my interpretation, but i think it's fairly clear that the transmigration thing works like Biju. The person is possessed by their soul. Like a jinchuriki, the host gains access to all their power yet still needs to train to use this. The Sharingan's powers however make learning jutsu far more convenient, hence the power scaling difference.

Similar to the recreation of the Juubi, it's not just that Indra and Ashura chakra mixes, it's that this chakra actually transmutates into a new chakra, with powers beyond it's own components. Obito himself however does not have Indra or Ashura's soul attached to him. The borrowed flesh does (IE the Rinnegan) which is why that power is maintained, but his own eye does not and so no matter what he does, the change in his eye's soul will never happen and the soul/DNA connection won't force that dojutsu to manifest.

Note that Orochimaru's case proves that a soul connects to it's corresponding bodyparts (cut out the soul of the hands and the hand dies. Presumably, cut off the hand and the soul is disconnected too. I presume that control over this latter process is what allows people to survive otherwise fatal incidents).

So the Rinnegan can fill Obito with power, which he can use for his benefits and whatever. But that chakra will never transform his eye. BTW, blame Kishimoto for calling everything chakra, despite the chakra-flesh of Biju being different from their chakra-soul and chakra-chakra and chakra-DNA.

BlazeRelease wrote: Ashura reincarnations taking hold of Rinnegen wouldn't be impossible but maybe a stretch. It's a stretch because they have no need for it (their situation ensures that they inevitably outscale the Uchiha). So initially they'd be unable to defeat the Uchiha to take their power, whereas by the time that they can, they don't need it. Besides, the Ashura start with little power and have to rely on friends, which is why they learn the value of teamwork, so they're less inclined to obtain more power for power's sake.

Contrast the Uchiha, who took enormous pride in their eyes and pretty much instantly learn that power is quite useful. This makes them more inclined to search out greater power. Plus, their clan history may make them inclined to think that the Ashura owe them something, and their lack of physical power may make the Senju's power a nice fit. A Senju however would never be able to deactivate a stolen sharingan while it is continuously draining their power, so a stolen sharingan is not nearly as much of a power upgrade as Senju flesh is for an uchiha.

Lastly, considering that he fucked over the elder brother, it's no surprise that Hagoromo was worried for him and his clan. So yea he left Indra's clan the message that they should cooperate.