Until real confirmed spoilers drop and debunk me, I'm not convinced that Zoro defeats Lucci at all. Lucci should be stronger and Zoro is build up as the slight underdog in an equal fight that Lucci has to dominate.
If Zoro manages to beat Lucci no matter how much effort, even if he goes all out, he has all my respect and I will admit he's Low Top Tier. Cause Lucci is easily stronger than any Yc1 and proved to be able to tangle with a Yonko.