If BM Naruto fought the 5 Kages...this fight would end fast with Naruto standing lol. With Naruto's "new-found speed and power" (he kicked the s*** out of 5 tailed beast bombs at once), he should be able to form 5 rasengans or even worse, 5 mini-rasenshurikens and blitz the 5 Kages all at once. Gaara and his sand would not be able to react to Naruto's speed...sorry. For Naruto's defense (not that he has to defend), let them charge at Naruto and get pulled into that crazy spiralling absorbtion sphere rasengan.