I'm sorry, but I'm going to have to side with Pro-Rinnegan. I can't imagine someone having immunity to Genjutsu of any kind simply because they have a certain-type of chakra. Regardless of the type of chakra, they should still be susceptible to Genjutsu period, let alone Genjutsu as strong as IT. The Rikudo chakra in the Susano'o was necessary for blocking out the light of IT, not for Sasuke's sake, but for the sake of everyone who didn't have the Rinnegan. HOWEVER, theoretically, Susano'o might have only been able to negate IT Genjutsu because it is made of Yin chakra, and so Naruto using a Yin-Kurama chakra cloak would have been able to negate the light of IT as well.
It just makes since; Sharingan Genjutsu can cancel out Sharingan Genjutsu, yet both Jinchuriki and Bijuu are still susceptible to Sharingan Genjutsu. Rinnegan Genjutsu can cancel out Rinnegan Genjutsu, yet both Jinchuriki and Bijuu should still be susceptible to Rinnegan Genjutsu.
It just makes since; Sharingan Genjutsu can cancel out Sharingan Genjutsu, yet both Jinchuriki and Bijuu are still susceptible to Sharingan Genjutsu. Rinnegan Genjutsu can cancel out Rinnegan Genjutsu, yet both Jinchuriki and Bijuu should still be susceptible to Rinnegan Genjutsu.
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