It makes perfect sense when you think about it, Sasuke revealed in the latest chapter that this whole time he was waiting for all the threats to his Revolution to be eliminated. Madara, Kaguya, Obito, Black Zetsu, the edo Kage, and double kamui Kakashi mainly and now Naruto is the only one left. During the fight with Kaguya, Sasuke stated that he or Naruto couldn't die because they had to seal her, so he cooperated, but in the back of his mind he knew his true goal was to take out Naruto. Sasuke did next to nothing against Kaguya because he was preserving chakra and letting Naruto do most of the fighting. Sasuke's not dumb he realized early on that his rinnegan eye and Kaguya's would simply cancel eachother out, so Naruto was better suited to fight her. Now that Kaguya has been sealed and the other threats removed, Sasuke is relatively fresh while Naruto has exhausted most of his chakra and the bijuu are locked away in Chibaku Tensei so they can't leech him more. I personally would like them not to fight now, because logically Sasuke would win easily at this point. I want them both at their best.
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.
Sasuke knew pure strength won't do anything and will be ineffective no matter how strong you are, since she can regenerate any damage you give her, he knew the only way to defeat her was by sealing her, saving chakra since its not needed U_U
Plus the only person who could really damage her was Naruto since he has senjutsu (nature energy), it would be harder to detect compared to Sasuke's
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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Sasuke even confirmed this last chapter, while they were fighting he was getting used to the rinnegan, the only rinnegan ability he used in the battle was S/T, the rest he managed to train it somehow
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.
Perfect Susanoo is a Ems technique, clearly not his strongest tech to anyone with a few brain cells, and he used it mostly for defense the same way naruto used his chakra cloak in the same way
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 was testing her strength, like all great shinobi do, not just randomly using tailed beast chakra or shadow clones like some people. He knew sealing her was the only way to win.
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?