Board Thread:Versus Debates/@comment-26005711-20160614093346/@comment-25122992-20160614112110

Rage gtx wrote: Moot point because first only known "Original" owner of Rinnegan is Hagoromo, second because we don't even know that Nagato wastes more chakra than Sasuke on exact same technique and last from two only Sasuke shoved having weariness from Rinnegan usage - him closing eye for cooldown, and using hair as eye cover also does not help. Firstly, I'm sure you know what I meant by "original" - the one who actually awakened the Rinnegan. Some artificial means surely must be used to achieve it (i.e. Asura+Indra chakra mix, which requires Asura chakra to be obtained), but since the chakra itself wasn't a natural part of human live before Kaguya's/Hagoromo's deeds, it's not that a sin.

Secondly, it has always been a constant rule that a wielder of a transplanted doujutsu needs more chakra for it's use than the original owner. Nagato was able to handle Rinnegan and use it effectively only due to his Uzumaki heritage - their chakra reserves and lifeforce respectivelly. A regular shinobi wouldn't be capable to do so, even Obito could handle just one eye, despite being an Uchiha with Hashi's cells.

And finally, it's pretty clear that such a powerful eye as the Rinnegan can't be used constantly. Nagato tried to do so and turned into a crippled skeleton, although with some help from Hanzo. Hair cover can be just some stylistic addition to Sasuke's design as an adult, to give him "Madara-style" look (who surely didn't need any hair cover, but had it anyway as a part of the usual appearance). Moreover, we've already seen that Sasuke (in the Last Movie) can simply deactivate the Rinnegan at will, akin to his Sharingan. The Rinnegan is still a doujutsu that consumes chakra and shouldn't be used carelessly. It seems that only Hagoromo was capable of the constant use, but that's the Sage of Six Paths himself, whose abilities were almost unrivalled, plus at the same time he was a TTJ.