Board Thread:Theories and Speculation/@comment-32742265-20180119154238/@comment-734582-20180125174143

Kingomanoki wrote: I'm just confused if whether it's actually nature transformations that they haven't mastered yet or not having the necessary chakra lvlv, or is it actually nature transformations they haven't learned to perform. If they can copy the jutsu, they can copy how to perform the nature release. As long as the user has the theoretical capability to perform the jutsu, they can.

Kakashi can't do Rasenshuriken because he either lacks the skill or the chakra. Since he doesn't seem to use wind release a lot, it's probably both. He can't do Ice Release because he lacks ice release. Madara couldn't do Wood Release because he lacked Wood Release, but upon gaining it could perform the jutsu.