i have a theory that "that jutsu" is an advanced clone technique. Kind of like a shadow clone technique that actually multiplies the body to a certain number. Mix "real" bodies with dozens of clones and the distraction element of kage bunshin becomes much more effective. And if one of the multiple bodies gets killed (even the "origional") the other master kage bunshins can act as the new original. I mean, naruto was a chakra tank but now he has alot more. And he has the essenes of a total of ten individuals. Maybe that's why he needed kurama's chakra/help to complete "that jutsu". Another actual individual and essence to multiply his own. And now he has eight more. Well, you all can do the math
example: Naruto makes 2 mkb, yes? One on the left, one on the right. If the middle--technically the origional--dies yet at least one of the other two survive, naruto is still alive.
I mean, think about it. The biggest problem with kb is that even though the enemy can be outnumbered, naruto is still screwed if the origional is pointed out and hit. And kage bunshins are temporary slivers of his real self. This theoretical technique makes both problems moot. I mean, mix dozens of kage bunshin clones with half a dozen "real" narutos and you have a serious threat from a somewhat simple idea. He made an improved perv jutsu and bright back his old taijutsu move--both on a higher(ish) level. If he is going back to his roots, i think an updated kage bunshin is a good and fitting jutsu
in the end, naruto's fighting style is coming up with clever and resourceful ideas that are unexpected and unthinkable by anyone else. He is a clever and origional heinous in his own right (oxy moron due to a lack of sheer intelligence) and that is why this is a perfect theoretical technique. It goes back down to naruto' roots at the very beginning.