Not a skill ranking but the best genjutsu user. I would say Kurenai along side with Itachi. And look at Sasuke he couldn't even put Danzo under a genjutsu with mangekyou sharingan
I like what your saying
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you too, only thing i disliked that you mentioned Kaguya thats no question to go there
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and yes ofc Kurenai is good genjutsu user