Do you have any proof that he isn't? You do realise Zoro always has been shown to be physically very strong and even his defence/endurance. Also I don't see the point of your arguments, what you trying to argue here that Zoro isn't strong as with the swords? Then Luffy isn't strong as without Devil Fruit, King haki, his DNA, Sanji same thing with no modified dna, suit, Kaido probably a fodder without his dragon fruit and DNA, same goes for all the top tiers characters by your logic. You can argue and cry as much as you want, but that's just how it works in one piece. Zoro only supernova without any devil fruit btw along with Killer but Zoro feats surpasses many top tiers easily