Did you forget the fact Sasuke had to suck in tailed beasts chakra [large portion] to keep up with the RM Naruto [who has been fighting without rest]...
It was the same case scenario for both of them..
Lol i knew someone would point that out,i was practically setting out bait.And how was Sasuke able to suck out large portions of the Bijuus chakra? The RinneSharingan,and what happened as soon as he did? Naruto went from using 1 Kyuubi Avatar to counter his PS,and 1 BD to counter his Chidori too making 3 clones with 3 Kyuubi avatars,and using 3 BD.
Sasuke speed blitzed 1 of the Kyuubi Avatars,sending him crashing to the ground then he easily handled 3 Kyuubi avatars hand to hand then they each used 1 BD which he countered by using 3 mini Lightning Arrows which left Naruto running out of chakra until the Kyuubi (the one who earlier crashed into the ground) gathered all the Nature Energy above ground for Naruto.
Naruto and Sasuke were both revived by the Sage in full condition after Madara owned them.They both used alot of chakra during the Madara and Kaguya battles. Chakra levels isn't an excuse. Naruto always had more than Sasuke so him having used more can't be used as an excuse.
For Example
The Sage gives them power and in total Naruto could have 250 percent chakra while Sasuke has 175.Then by the time their fight starts,Naruto has 130,while Sasuke could have 100 until he used his own powers to get the Bijuus chakra which was part of his strategy.
Sasuke only used 4 of his RinneSharingans powers
1)Chibaku Tensei
2)Teleportation
3)Preta Path
And i hear that he used
4)The outer Path in order to used his Susano'o as a vessel for the Bijuus chakra instead of the Gedo Mazo.
He can potentially use all 6 paths,and master all 5 basic elements.With the Sharingan he can copy all Jutsu besides KKG,and with the Rinnegan he can learn and master all five basic nature elements - he has the potential to learn/master most Jutsu.