Zoro won thanks to haki and training.
Couldn't cut Mr. 1, learned advanced CoA, defeated him.
Learned Ashura / advanced CoC, defeated Kaku.
Mastered advanced CoC, defeated King.
Never once he was saved by destiny fruit nor daddy genes.
Nor destiny sword like
@Monster Luffy said. If anything, when he fought King, Enma kept distracted him. Enma was a nerf.
Zoro traded Shusui which is already a black blade owned by Sword God, to Enma which distracting and owned by weaker swordsman than Ryuuma.
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I am open minded and willing to change opinion, unlike majority of the posters here.