Is it just me, or is Kakashi the only person with a Sharingan who has completely copied a technique? Sasuke 'copied' Lee's speed, and the first bit of Primary Lotus (i think. not sure exactly which one it was), but those don't count as speed isn't a jutsu, and he didn't completely copy Primary Lotus. Kakashi has taken so many jutsu into his arsenal with his Sharingan, whereas no Uchiha has been shown to do that (if they could, would Itachi not have copied jutsu to make him an even MORE formiddible foe?). My theory is, true Uchiha's don't copy jutsu because that's cheap; it's sort of an honor thing, like traditional Japanese samurai. Uchiha must work if they want a new jutsu, but Kakashi doesn't. That seems cheap to me. The only jutsu Kakashi worked for was Chidori (if you count raising dogs as hard work, than his summoning as well), and then he just took a thousand jutsu. I'm not a Kakashi hater, I just think there's a reason no actual Uchiha just copies a thousand jutsu and calls it good, and Kakashi just abuses his Sharingan (there, I said it!). Don't hate, I'm just saying, 'Copy Ninja Kakashi' is a bit cheap, and it get's cheaper when no other Sharingan user does that.