No no no
Naruto didn't come close to soloing Nagato.Let's be very clear.
He had help from Kakashi, Tsunade, Katsuyu, Ino, Inoichi, Shizune, Chouza, Choji, Ma and Pa, Kurama, Konohamaru, Ibiki and countless other shinobi. What Naruto fought was a Nagato who had been weakened by his powers being discovered by the hidden leaf shinobi, and most importantly, a Nagato who had just used his largest attack. Even then, he hadn't killed Nagato.
The way the rasen shuriken works is that it cuts cells apart. Which works permanently only if the resulting wounds are fatal or there is no more cellular growth. Additionally depending on how Naruto uses his shuriken the damage area could be reduced, making it easier to evade.
Sage Mode Naruto isn't on the level of the kages. And he would neither beat Kakashi or Gai. He'd beat Asuma and Kurenai. It's a question of whether he would beat Neji and Hiashi without the nine tails' help. And he'd beat Darui high diff. But he's not at the level of these kages.