Can you comprehend something basic? You need to have self awareness of what your logic implies. All of your made technicalities disqualify Zoro from being a swordsman.
Haki, devil fruit, brute strength, speed, endurance etc are all factors for WSS as seen with Zoro's battles. Your "skill only" doesnt make sense unless you explain how Zoro and Oden won their battles with sword skill alone.