Sasuke still has his Six Paths power, the Rinnegan. I understand that the other Tailed Beasts are no longer in him... but in the 4th War, even when Madara pulled out the Nine Tails, Obito gave him the One Tail and the Eight Tails chakra; thus, he was able to use his Six Paths power since he already had chakra of all the other tailed beasts.
Why doesn't Naruto have his Six Paths power?
Naruto did not lose his Six Paths senjutsu because he can still manipulate truth seeking balls, and his eyes also exhibit that he is using it in battle (tailed beast eyes crossed with sage eyes with no eye shadow).
Sasuke awakened the Rinnegan because Kabuto used Hashirama's cells to heal him after Madara impaled Sasuke with a sword. Thus, Asura's chakra mixed with Indra's chakra, becoming Hagoromo's chakra, thus allowing Sasuke to awaken the Rinnegan.
Basically, nothing has changed, except that Naruto and Sasuke can't use the Six Paths Sealing jutsu anymore because it can only be used once per lifetime and the two already used the jutsu to seal kaguya
After Sasuke and Naruto sealed away Kaguya, Naruto lost his Sage Of the Six Paths powers (SOSP). This is most likely because Hagoromo gave Naruto and Sasuke powers to defeat Madara or basically Kaguya. That is most likely the reason Naruto lost his SOSP powers.
Sasuke, on the other hand, cannot use the Sage of Six Paths senjutsu, but he can still use Rinnegan. I would imagine that it has gotten weaker since Sasuke in one of the Boruto manga had to charge up his Rinnegan powers and he no longer has the SOSP senjutsu.
Naruto and Sasuke do not have Six Paths power. They lost this after sealing Kaguya.
The Boruto designs contradict that of Naruto: Shippuuden because Naruto in So6P (Naruto: Shippuuden) is seen having the same pattern that Juubidara, Juubito, and Hagoramo had. But, in the Boruto series, it's KCM, not So6P. In his fight against Momoshiki, it's KCM because you can see the Kurama Chakra Mode from his tongue.
Sasuke, on the other hand, still has the Rinnegan but doesn't have Six Paths power because every other Rinnegan (Hagoromo Rinnegan) user could use the Six Paths abilities. And, with Six Paths powers, they do not run out of chakra, as we see Sasuke could spam Susanoo more than twice after getting it destroyed. Whereas in the Boruto series he got knocked down and couldn't stand up, resulting in him using Amaterasu instead of his Rinnegan genjutsu.
the reason he doesnt use the 6 paths power is not bc he sealed kaguya bc they then used there 6 paths power to stop the infinite sukoyome its bc when narato and sasuke fight they both lost there arms in the battles they lost the arms with the light and dark marks and hogoromos charka in it and the reason susuke still has his sharirenigan is bc he awakened it bc he had the six paths charka to trigger its awaken and the charka then went into his eye which then let him keep some of his 6 paths chakra.
Naruto has and uses his Six Paths power.
In Boruto, when Naruto & Sasuke fights Momoshiki, he uses his Six Paths power against Momoshiki. Naruto has Kyuubi chakra and Sage Mode chakra mixed together, and when he mixes them, there are no pigments. However, when he uses regular Frog Sage Mode (or whatever it's called), there are pigments under his eyes with Sage Mode, and when Naruto came back from the psyche plane with Hagoromo, he received his chakra and received Six Paths Sage Mode.
In The Last: Naruto the Movie, he also uses Six Paths power and Ashura's Fist.
About Sasuke's Rinnegan, it's because he got Hagoromo's chakra directly, not because of Hashirama's cells.
About the whereabouts of his Truthseeker Orbs, they can only be used once, then they are gone.
