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Everyone was cuting those trees, including fodders or non-lethal attacks/swords like Samehada, Enma's staff or Madara's. These trees have shown no durability. One hit was enough to cut them
And once again, when Kakuzu kicked Kakashi for example look what happened to these fodder trees, yet Kakashi received no damage from that
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In this manga at least, ninjas have much greater durability than fodder trees that every fodder was capable to cut
Those trees he cut with his suiton have shown no durability to suggest it can cut a ninja