Originally posted by: NineTailsKitsu
That's right, now take into account that Kaiten manipulates Chakra just like Chidori and Rasengan, but for a differen't purpose. Compare Sasuke's body stopping arm's length in the tank, to Sasuke's attack stopping short of actually Hitting Neji IF he managed to puncture through Kaiten. Again, Sasuke would be caught off guard, and...Well I'm not going to repeat my self on that possibility.

BTW, as for your Hinata/Neji example of Jyuuken.......The reason why Hinata didn't die from her injuries (though she was extremely fucked up from them) is because Neji didn't want to kill her, this would be entirely different in a Demon Seal Sasuke vs Neji fight, were Neji would know he'd have to fight for his life.
I suppose for that first point, I naturally assume that when the chakra in the Kaiten is disrupted enough, it breaks the Kaiten. This happens both when he was attacked by Naruto during the chuunin exam, and also in the Narutimett Hero games (this is not evidence, it just adds to my assumption). I'll wait for Strider's responses to my previous argument.

Also, Neji was going to kill Hinata. He had to be stopped by the rest of the Jounin to prevent him from doing some serious damage. This is back when he was asshole-Neji. In any case, my point is still the same. Jyuuken doesn't work in a "one hit anywhere on the body is an instant kill" way.