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Yup there you have.kishi went out of his way to say kurama was going to sleep.next pages shows kurama eyes closing.
So while Naruto is making the rasengan and kuramas sleeping,theres no reason Sasuke couldn't have just genjutsu him.naruto has never broken genjutsu once and we've since solo finger low dif him
Sasuke used his remaining chakra in his chidorikagatsugi combo and probably didnt even know that Kurama went to sleep.
Naruto never went for a kill in the whole fight.
That is way bigger of a nerf than anything you make up for Sasuke, who tryed to kill Naruto.
And how is using all the bijou into a Susanoo a nerf in the overall fight for Sasuke?
If anything with that counted, Sasuke was buffed overall in that fight. That weighs up way higher than any possible nerf you can bring in.
Naruto only had a tiny bit of 8 of the bijou, which is in him willingly.
It was a battle of wills between Naruto and Sasuke and Naruto won that fight, because they both ended up immobile and Naruto changed Sasuke's heart again.
They are equals now battlewise. They are yin and yang.
Thats just how it is.