I agree that Zoro isn't a fighter, but I don't agree that Zoro is a swordsman, he is a swordmaster at this point in the current arc, and someday when he beats Mihawk he will be noted as a swordslord, and when he beats Venus he will noted as swordsgod
from there who can beat him, someone who can beat one of the five elders memebers, let alone beat Zoro, who is ignorant who dares to challenge Zoro in a sword fight
and if there are no enemies out there then there is only one enemy left that he can defeat, namely himself, if he can defeat himself then he will reach the point of enlightenment and will be noted and remembered forever as a swordsgrace.
I'm more interesting on chopper, is chopper a doctor or emergency food coz luffy have repeatedly stated him as emergency food