Quote Originally Posted by Yukimura
Yet this is not what happened, Sasuke, a genius with Sharingan had to actually work hard and learn to use nature manipulation so he could use chidori, even after he'd seen it with his Sharingan.
Minus the part where it isn't a Jutsu?

All in all I'm not sure why there is such a big argument over this. We don't have evidence either way since the whole subject is pretty hush hush so why put all that effort into asserting you are correct?