Board Thread:Theories and Speculation/@comment-5413572-20151114042410/@comment-734582-20151208113739

QuakingStar wrote: even if they expend Hagoromo's chakra they would not lose their SPSM and Rinnegan. There is no need for arguments such as this. Manga clearly shows that chakra gifts are temporary. Therefore, Hagoromo's chakra was expended by Naruto and Sasuke. Hagoromo was able to turn a bit of chakra into nine physical beings with individual powers and individual personalities. If he can do that, his power of All Creation (or whatever it was named) can ensure Naruto has (and keeps) SPSM and Sasuke has (and keeps) Rinnegan. They were using Hagoromo's chakra against Madara, Kaguya and in the Valley. After that, they used the Six Paths chakra their bodies can now create on their own. Especially since Sasuke without a doubt has the requirements (Hashi cells plus Indra transmigrant) and Naruto probably can do it because of the Biju.

After all, the Biju giving their chakra to Naruto implies heavily that acquiring the individual biju chakras is a second way to recreate Hagoromo's power. Sasuke met Hagoromo and recreated his chakra via the merging of the two Transmigrancies. Naruto met Hagoromo and apparently recreated his chakra by attaining the power of nine tailed beasts. Therefore, Naruto and Sasuke can make their own Six Paths chakra. What influence this has on their power level is completely unknown, but it seems Naruto isn't quite as god-like (he seems to have no flight, TSB's and the mostly-black cloak) and Sasuke has less technique-spamming (considering Gaiden, where he seems to take more time than usual to regain his Mangekyou).

Whatever way one wants to argue, it's plainly canon that Hagoromo's chakra is expended, and given that Hagoromo is a god-like being, ensuring his gifts of SPSM and Rinnegan remain should not be a big deal at all, especially since Sasuke has Hashirama's cells.