Doubt. Jack can't put Zoro down very quickly. Zoro also isn't completely helpless without his swords (swordless sword style for example). Zoro isn't winning by any stretch, but considering the effort/time it would take to put Zoro down, I wouldn't call it a low diff.
Neg diff thn?
I believe we have to give Zoro some benefit of doubt and call it low diff. He might evade and tank few attacks.
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Calamities probably can low diff Veterans, i can't see swordless Zoro arround Vergo, Pica or Pageone lvl tbh.
Maybe not even Pedro, who was hella fast and trained fighter.