Why are People confused with Zoro's Forms lol
They are same as Luffy
Luffy has Gear 1
Zoro has Two-Sword Style
Luffy Increases his Speed by tapping to Gear 2 & Increases his Strength by tapping to Gear 3
Zoro's Speed Increases when He uses One-Sword Style & his Strength Increases when He uses Three-Sword Style
After that, both have a Temporary CoA Form
Luffy calls it Gear 4 while Zoro calls it King of Hell (Green Smoke Form)
And Finally, both have an Ultimate Form which represents their Fighting Style on Steroids
They are Gear 5 & Nine-Sword Style (Asura)
Both can Apply their CoC to any of these Forms
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So when it comes to Lucci Fight
Luffy fought him using Gear 5 (No CoC)
While Zoro is fighting him with his own Version of Gear 4 (Also No CoC)
Throughout entire Story, Oda keeps showing that Zoro's Forms are Superior to their Equivalent from Luffy's Forms