rasenshuriken is wind style so its weak against katons by default.
if rasenshuriken clashed with a katon thats at a high enough level, the wind chakra thats rotating around the rasengan would disperse. only the rasengan in the middle would be left and according to pain, rasengan cant be thrown. without the user rotating the chakra for the rasengan or the wind chakra surrounding it, the rasengan in the middle would disappear instantly.
I agree with this, exactly what I was thinking.
I once made a
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where a compared Temari's fuuton with Sasuke/Itachi's katon.
I think people underestimate the rotational power of the rasengan in dispersing
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Going by this logic, current base Naruto overpowers a regular sized katon from Sasuke with an Oodama rasengan. Rasenshuriken is way above Sasuke's level of katon attacks so it will slice through it while only depreciating in strength by a little bit.
Amaterasu and enton surely counters rasenshuriken but I'm not sure about Madara's, Jiraiya's and Kakuzu's katons.