Originally posted by: polaris79
My, my, you're fairly persistent at pressing home this point. =)

I disagree. While the sharingan is automatic with its jutsu copying, it doesn't translate into reflex-based responses. It takes conscience information processing to make tactical decisions like how to positionally counter the defensive response to the chidori. So all that is needed is to precisely see the counter. Sharingan offers the sharp sight. So does the byukagan.

Also, recall that the sharingan was derived from the byukagan. While there may be differences between the eye jutsus, there are also similariteis due to their common origin. One of those simlarities is the sharpness of sight.
lol... dude, you're still not getting it man...

recall back to when sasuke activated his sharingan against haku. while his normal eyes could not see any of the movements, as soon as he activated his sharingan, sasuke was able to track haku's movements and react to them to a certain degree. that's why the sharingan is needed for someone to use the chidori effectively. the sharingan allows the user to basically see the movements instantly as they happen. it's almost like seeing every movement frame by frame.

now... last time i checked, there was nothing explained about byukagan letting the user to read and counter movements quicker than the normal eye. the sharp insight sharingan offers is different than byukagan's insight.