But RasenShuriken works on a completely different principle of making tiny cuts and vaporizing a susceptible target. The Nine Tails couldn't be vaporizing
And I've said it once I'll say it again. Stop using feats from inside people's mind.
What happened to pain was outside his mind. If being in his mind made him stronger than there'd be some manga indication and Naruto would likely not be in any danger at all. Naruto showed chou odama rasenshurikens outside his mind anyway and Kurama took a juubi laser.Kurama is tough as shit point blank period. In narutos mind he wouldn't be able to throw kurama in base form but in sm he could just like in the outside world his abilities remained the same. The feats are legitimate cause they mirror things he's already done or will do at that time from throwing heavy beings to making giant rasenshurikens like in the war. Kurama wasn't nerfed nor over powered so any claim that these feats are illegitimate is not supported by the manga or even slightly hinted.
Rasenshuriken base principle is grind that mf to bits and mess up his chakra network
With senjutsu it gets taken to a whole nother level as seen in the pain fight.
Kurama can tank attacks that'll obliterate other beings as seen in his fight with Naruto and the juubi.
