Naruto was never meant to have a new jutsu, he was gonna use clones but due to the alliances arrival he called it that to show Madara and Obito the will of fire and unity within the 5 nations.
This. Seriously. I cannot express my frustration right now. I've said it a million times: It was never a "new" jutsu. Naruto was referring to teamwork ffs. That whole "wind cutter" technique was made from a random ninja in the background to clear the battlefield of the dust.