Re: elemental rasengan.What do you think?
chidori is not the lightning rasengan.
chidori is simply a high concentration of lightning chakra in one place... nature manipulated chakra. rasengan is "plain" chakra spinning in every direction... form manipulation. kakashi can do both rasengan and chidori, but is unable to fuse the two. a lightning rasengan (like narutos new jutsu) would combine both nature and form manipulation.