Board Thread:Theories and Speculation/@comment-27717552-20160513151229/@comment-24824859-20160514114201

@Thekillman Kakashi's chakra reserves has improved over the course of the series. If shadow clones are too much, then he could easily use lightning clones, which take far less chakra. You're probably right about the fact that the Rasengan strains Kakashi If Minato had time to develop the Rasengan, then he should of had time to add a chakra nature to it. But I guess being Hokage takes priority. Rasenshuriken is the result of adding wind-natured chakra to the Rasengan and then taking it a step further. We don't know what chakra-nature Minato wanted to add to the Rasengan