And no point was Zoro stronger than Luffy. And it makes no sense anyways if it was like that, crew dynamic and story wise. Zoro was never portrayed as that either.
It was always Luffy > Zoro, and apart of Enma there is no real improvement Zoro made after the TS, while Luffy constantly surpassed his limits. Its not even close rn, Luffy low diffs Zoro. He doesent even need Gear 4 to beat him.