Board Thread:Theories and Speculation/@comment-28300173-20161004230450/@comment-734582-20161007061937

Hokage Kakashi with Six Paths Chakra should be a beast (it's sadly still not clear if he retained that power. If Sasuke and Naruto can keep it though, why not Kakashi?).

Hokage Kakashi learns Hiraishin (why not? Minato was his sensei), uses Raikiri and reproduces Sasuke's chidori modifications (no need for sharingan with a 5-meter lightning beam). With Six Paths power, he should be able to create Lightning Release: Rasengan (he could make rasengan and has considerable lightning release prowess. Surely by now he can combine the two?)

Coupled with his wealth of experience and long list of jutsu, he should be a real force to be reckoned with.

EDIT: Hinata with Tenseigan (due to Hamura's chakra), with Shikotsumyaku would also be fun.