That is if Naruto manages to hit something with his rasengan
Kakashi's logic is the best when it comes to the Chidori. He had Sasuke improve his speed before he learned him the Chidori. This way an attack is harder to avoid.

We'll look at the rasengan as an improved and stronger Chidori, but Naruto lacks the speed. So he's nothing with it.

I do hope Naruto doesn't show up