Who claimed Naruto to be stupid? Listen to my words carefully so we don't drag this argument:
Naruto created FRS with his NE and chakra, so that he could combat Sasuke's Indra Arrow. The chakra output Sasuke used with the TB was too much for Naruto to combat alone, which is why he used the TBBFRS (Wind) and the TBBRS (normal). Two techniques in total.
Wind > Lightning, if Naruto's attack was stronger, Indra Arrow would have been demonlished, it was not. Which is why they stalemated. Take away the FRS (Wind) in the equation, what happens?