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I don't believe Senjutsu is a weakness in the sense you're trying to argue.Also him being injured by the Rasenshuriken is not relevant here as it is senjutsu and senjutsu is the weakness of the Juubi Jins.
While Juubi Jins are weak against Senjutsu based attacks they don't take enhanced damage from it, so scaling people to damaging Juubi Jins with Senjutsu enhanced attacks is completely fine.
Senjutsu just allows people to bypass the inherent invulnerability that Juubi Jins have against Ninjutsu, this is backed up again by Naruto and Sasuke.
(Note - i could be wrong since i'm not that knowledgeable on Naruto so if Slayer or someone like him could either agree with what i'm saying or debunk it that'll be great)