Board Thread:Naruto Discussions/@comment-27521865-20190624190722/@comment-1458758-20190720031706

Missy0124 wrote: @FlatZone

No he can not use the rasengan as the lightning blade as a jutsu was made to be a recreation of the rasengan but he could get the change in charka form unlike naruto.

The Lightning Blade is Kakashi's attempt to add elemental chakra to rasengan, he didn't even have a sharingan when he first developed it. We literally see Kakashi form a regular rasengan when teaching naruto about elements and improving the rasengan. So yes, he can do it, he learned how to do it, presumably without a sharingan at all.