Originally posted by: mage
ok, ive seen the word "rasendori" twice in this thread. its rasenGAN. There is no such thing as "rasendori", though i believe it's a forum members name.
lmao! seems like im the source of confusion.

on topic: i think its logical to assume that yondaime created the rasengan before kakashi created the chidori. it was probally the rasengan that inspired kakashi to create his only original jutsu.