With these four people, Gisu is added on.
He's useless in combat, but everything outside of that he can perform at a high level.
Confirming the map, establishing the direction to advance, management of food, sorting the raw materials. He has the judgement to withdraw from the labyrinth as well.
He works as the control tower and does odd jobs.
I guess it would become a feeling like, Director.
Since exploring labyrinths isn't just about combat, naturally as it is having someone take on roles like this is necessary.