Understanding that some things are exclusive to Luffy and Zoro in the Strawhat crew.
The system (StrawHats): A system is a group of interacting or interrelated elements that act according to a set of rules to form a unified whole. A system, surrounded and influenced by its environment, is described by its boundaries, structure, and purpose and expressed in its functioning.
The components (Luffy, Zoro, Sanji): a part or element of a larger whole.
The role (Captain, Swordsman, Chef): A role is a set of connected behaviors, rights, obligations, beliefs, and norms as conceptualized by people in a social situation.
- The StrawHats work as a system, they have a purpose and they express it in their own ways.
- System has components. They rely on each other to function as a system.
- Each component has its specific role. If that component fails to perform its role, the whole system goes down.
Take the human body as an example:
To say the brain and the heart is the most important component of the body is right. But, to say the stomach is less important is wrong.
One cannot function without the other.
Likewise, each of the SHs fulfills their roles.
If they were not capable of fulfilling their roles, they would not have been a part of this "system".
One's superiority cannot undermine other's importance.