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, even as an Uchiha with Hashi's cells.