Board Thread:Theories and Speculation/@comment-32742265-20180119154238/@comment-6769189-20180125202550

There was the problem that the Rasenshuriken would hurt him if he used it....

Given that the Sharingan can see the flow of chakra and copy any movement and what not i dont see why it wouldnt be able to copy jutsu of an unmastered nature. The reason nature transformation is hard is because it requires the person to figure out how to manipulate their chakra, but the Sharingan sees all that, sooooo it should be capable of copying whatever it sees so long as its not KKG or tool reliant.