Originally posted by: Mut@t@
Hey, I don't know how the sharingan copying stuff works and neither do you. I'm just going by what the anime said.
So do I. The manga clearly said:

- if you don't have enough chakra for a jutsu, it will fail and you might die.
- you can't summon without a blood-contract
- you have to be physically able to perform copied taijutsu.

I'm just not looking at statements from the manga as isolated as you seem to do when it comes to to Itachi.