Board Thread:Theories and Speculation/@comment-27717552-20160513151229/@comment-28575329-20160609091311

Kakashi didn't need to try (and fail) to add nature change to the Rasengan to invent the Chidori. Knowledge of the Rasengan didn't help Kakashi create the Chidori. Saying that the Rasengan gave Kakashi the idea for the Chidori is an unfounded assumption, as far as I can tell Kakashi never said that. That's all I'm saying.