Why Naruto isn't stupid

[bagandscalpel]

well the fact that his rasen-shuriken failed wasnt naruto's fault. he had never used it in battle before, the proper use was never explained to him, and like he said, the name does indicate that it should be thrown, rather than used to strike an opponent.

But, in the end, he DID use it to strike Kakuzu before launching it.

That reasoning is moot since the technique was used exactly like a sharingan should.