You do know Kurana replenish his chakra right? Naruto been in base since they sealed Kaguya so Naruto would still have more chakra than Sasuke who was using Rinnegan jutsus which would be costly as MS jutsus are. No they wouldn't cancel each other out, Kaguya was far stronger than Sasuke and destroyed Sasuke's strongest power, PS. Sasuke knew Kaguya was on another level the moment he said her chakra was on another level. Sasuke had the Rinnegan when he was fighting Madara yet Kishi nerfed Madara so he wouldn't use his Susanoo, wood jutsus, wood clones, katon jutsus, Rinnegan jutsus (Deva, absorb, weapon, summoning) which he used pre Jin and as an Edo yet he stopped using them as the Juubi Jin when in fact all of those jutsus would be powered up by the Juubi power. No nerf and Madara with 1 eye would be both Naruto and Sasuke.
No he didn't, you needed to be strong to be able to get her in the position to seal her. You can expect to seal her without using a good amount of Chakra. Sasuke also have Senjutsu given to him by the Sage
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and
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You train it by using it, he was using his Rinnegan in the fight and that's how he got use to it. He did the same thing with his MS, he used it a lot which allowed him to master it as fast as he did.
Sasuke's PS was powered up from the Sage's chakra so it can be considered a Rinnegan jutsu since it requires both eyes and Sasuke use 1 EMS and 1 Rinnegan to use it. Naruto never used his Bijuu avatar at all against Madara or Kaguya though. Anyways he was new with his Rinnegan so his strongest attack was PS, if he discovers another jutsu that is stronger then it will change but he didn't until CT.
He had no reason to test her strength, he knew she was on another level
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. Naruto was actually the one who came up with plans that landed hits on Kaguya that allow then to almost seal Kaguya so how was Naruto randomly using clones and tailed beast chakra? Kakashi also came up the strategy that beat Kaguya so Sasuke couldn't come up with a stategy that could set up for sealing her nor could he do damage to her yet you're belittling Naruto who did both? If Sasuke knew sealing her was the only way then why couldn't he come up with a plan to do that? Why wasn't he strong enough to do just that?