Zoro's role in the story is literally just to be strong. That's why it doesn't make sense to expect any character to be far stronger than him by EoS except maybe Imu.
Zoro's role is to become one of the strongest characters in One Piece history and he serves as the badass Ryuuma insert, hence why he rarely ever looks bad, even beating the literal strongest like Kaido in head-on clashes.
Basically, it's not a good idea to bet against Zoro cos strength and fighting is all this character has.