So, Kakashi has stated before that he created Chidori because he couldn't combine his Lightning Release to the Rasengan.
He also stated that he was just able to copy the Rasengan with his Sharingan, but that's as far as it got.
Well... he attempted to make Chidori before he got his Sharingan.
So he must've used Rasengan before then. But then how did he copy it with the Sharingan if he didn't have it...?
Can someone help me with this? If this discussion has already been made, sorry, I'm a little newer to the wiki. But someone please explain what's going on with all that...