We've only seen the Sharingan copy jutsu's clearly a few times. When Kakashi fought zanza, sasuke vs lee, and sasuke in the forest of prelims. Ya there were some other times but those weren't in battle/clearly shown.

So my theory on Sharingan's abilities is a bloodline henge(sp?) that only needs eye contact(itachi pwning, kakashi vs zanza), and detailed eyesight and copying jutsus.

Can it see chakra flow?? i know it can copy seals(zanza) but it can't see the chakra points / chakra system, so do u think they can see how much chakra is used?

cuz kakashi when copying zanza he already knew the jutsu and sorta nudged him into doing that jutsu.

i'm curious to this becuz ppl are speculatin on whether or not sasuke could copy rasengan/ other moves. i personally think the limits of sharingan is the henge, detailed sight and thats it. i dont think they can see chakra flow, so they can't copy things that take training --->rasengen...

but then sasuke could copy the chidori... o.O

chidori - just a bunch of chakra collected to make a blade... i'm assuming it doesn't take alot of chakra control, just alot of chakra itself. No one else uses it cuz they run so fast that if someone dodged to the side, they couldn't see it(cept sharingan users and byakugan)

So sasuke could copy summoning seals(if he had scroll) but wouldn't kno how much chakra to put in ---> tadpole frog with no feet!!

maybe 2 dot sharingan can only copy detailed movement, and 3 dots is seeing chakra? or 3 dots is using henge.

what u guys think?

1 dot - seeing well
2 dot - chakra?
3 dot- henge?

i think the energy consumed by sharingan is mainly from henge, not from juss using sharingan. (i.e. fighting lee had no after affects)