Originally posted by: jing
How do you know all this? How do you know that chidori constantly pour chakra into the ball nonstop. I tihnk you are assuming too much. Unless it is explained somewhere in the anime.

Besides chidori is just TOO LOUD..
How else does it drain so much chakra? The sparks are probably the chakra dissipating into the air. Plus, the chakra isn't spinning, so the only other way is to keep feeding chakra. Assumptions aren't necessarily wrong you know?