While the above statement is true about what has Yamato done in recent battles. I can not even mention I use to call him a folder because he did not have the main fighting ability like everyone else. However, he never got his butt handed to him only at the end by helping someone else out. So basically when he first met Sasori as a decoy he was not afraid to fight Kabuto or Oro where this was a handicap match. This act of Yamato speaks for itself.
For me I am just going to agree, he could beat these people if push comes the shove. He has many abilities to win , but maybe if he was by himself without, main fighters like Naruto or Kakashi around, and he was fighting for his own life or death existence. He would take it up a notch.
Also I believe that in close quarters combat Hidan might get the better of Yamato. But that is when Yamato takes his fight at a distance and use powerful attacks. But I would not sleep on Yamato close quater combat even if we never seen it really. He has to be someone what decent judging by his anbu outfit
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Why hold a sword if you have no abilities in it or those sword blockers aka Arm projectors if he did not do close combat.
Remember when Kakashi picked up a sword he was proficient at it, (we seen him walk around with a sword as a child) remember Itachi with a sword. Notice when Itachi got a sword back how deadly he was with it. Not saying Yamato would be even on their level but he probably not a weakling at cqc at all like we think...
Now if Hidan does get blood he could try to make the sign but it would be a fail to an earth users who could just mess up the earth and mess up his sign markings (similar to when an earthquake mess up yellow,street lines) so it be pretty useless.
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Now Yamato is going for the win.