...I think we missed something obvious about RS
Okay pain can "ressurect" dead people and claim them as his own puppets in which can do many abilities, be it summoning, eating ninjutsu etc etc.
This is done by pain focusing chakra through pieces of metal which no doubt allow the control of the body.
But ive just realised why naruto is the only one who can stop this
Recently in the anime tsunade explained how narutos rasenshuriken tears out the chakra channels in each individual cell, and stops the body being able to use chakra, as most if not all the bodies cells have been damaged beyond repair for forming chakra.
Pains technique no doubt requires the bodies to absorb chakra signals for them to move and use there abilities, and if naruto "kills" them with rasenshuriken, the bodies cells will be destroyed beyond repair and the chakra signals will no longer run through the bodies.
This means pains usual 6 body facade he is using right now is useless against naruto.
Naruto can now seemingly shoot RS from a distance, and even better is naruto can fire up 5 of these in a few hours as we have seen during his training, and yamato said he barely got to 2, and then he used 3 against kakuzu.
He now has sage mode which replenishes his chakra supply really fast, this is shown by jiraiyas super rasengan, and then jiraiya not being worn out at all despite using easily 25-50 times more chakra than normal rasengan.
RS is perfect for taking out pains bodies!!