Yes sasuke did use chakra, but you are wrong on some things. Sasuke did not assist obito with anything, sasuke used amenotijakara to teleport through obito's kamui portal just before it closed. He did not assist obito in holding the portal or giving chakra, that feat does not drain him of much chakra.
SM doesn't heal anyone, infact after SM ends the user experiences exhaustion. As for your assistance thing, Sasuke's techniques are much less taxing than naruto's and even the kyuubi gets tired as well.
And finally naruto wasn't 100% either and even sasuke seemed to suggest that naruto was more exhausted than he was. Sasuke also absorbed the bijuu chakra into his susanoo while it didn't go into him all jutsu he used after the absorbtion was with their chakra not his own, sasuke only started using his chakra again after the explosion.
I never said he had to look winded all the time but there existed no single panel showing that. I mean if he was winded at least a single panel will be drawsn showing him looking winded as was done for others
Even kakashi was shown later not looking winded, my point is at least one panel is dedicated to showing that a character was exhausted, this was shown with sakura, obito and kakashi. They don't have to be drawn looking winded all the time but that one panel is always there, we didn't see that for sasuke.
Wasn't the kyuubi only exhausted due to the fact that his bond with Naruto was still being perfected via there being a time limit?
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also for clarification for what sage mode is/does for reiteration, also RIKOIDO SAGE MODE should be of a greater degree.
Also I would like a scan of this "implication", also I wasn't talking about helping obito to keep the portal open, I was distinctively talking about them getting from the core back to the ice dimension because we all know that Sakura was spent and obito was spent, and obito noted that it took a lot of chakra to use and even Sakura was shown using titanic amounts of chakra to get from one dimension to another, so saying it "doesn't require much jutsu" is undermining the kekkei Mora technique of kaguya, amenoninaka, unless you're saying amenominaka doesn't require much chakra to use which is laughably wrong for so many reasons
Also, it varies, in the anime it's stated, that sage mode heals, but they may have made Stamina and healing interchangeable. Because jiraya noted that the kyuubi actually helps Naruto heal faster than the average person which iscwhyvdespitr his injuries Naruto got out of the hospital before the estimated time and the frogs added notion to this with sage mode also being ancillary (this part may be anime exclusive), also the lists that I gave for sasuke's chakra taxing techs is worse than naruto's. While Naruto did use some titanic techs, so did sasuke. Like I said perfect susano, having a rinnegan that drains a lot of chakra on constantly is no picnic, amaterasu to the point of bleeding, etc etc all contribute vastly to chakra tax. Maintaining perfect susano is the most chakra taxing and sasuke's been spamming that, left and right while it doesn't take a lot of chakra (if any?) to maintain RSM.
Also to he second quote, that was the implication you gave, it helps to be more clear at times.
Overall I never said Naruto was at full power, I said Sasuke had it rougher than Naruto when you think about it. Naruto was running on tail beast chakra while sasuke was running on his own through most of the war which adds to it. But since Narito is Ashura's descendent then it makes sense for him to seek help from others but that doesn't mean sasuke's solo (literal solo bot fanboy solo) stance should be taken lightly.