Luffy surpasses Zoro as the strongest due to his physical strength and Gum-Gum Fruit powers. Zoro's hard work and training put him close to Luffy's level, aiming to surpass him by defeating Mihawk.

Scopper Gaban One Piece chapter 1140 will see Luffy fight against Gaban, but one absolutely must not forget the role of Zoro and Nami. Given that both of them are most definitely weaker than Gaban ...