You should have used these points in your agruement:
-Naruto knows all Sage mode jutsus (even the ones Jiraiya knew that didn't require fire element).
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-Sage mode taijutsus can't be seen unless you were trained to see/sense it so:
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and
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-Still don't know what "that jutsu" is:
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-Kakuza fought Hashirama and lived plus read what Kakashi said:
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-Not all injuries can be healed instantly (even Hashirama has his limits):
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-People seem to forget that Kurama's chakra is now filled with life force that affected Yamato's wood jutsus (A copied of Hashirama's):
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-Look at what Naruto's Kurama mode jutsus do to Hashirama cell infused white zetsus:
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We never seen KM Naruto attack Madara's wood jutsus, Kurama gave Naruto's clone chakra but he didn't go KM so Kishi is saving this for a rainy day.