Would you like an in-game parser?

[Lambdafish]

On the other hand the 4th group is both a and c combined. They DON'T know they're bad. They THINK they are amazing. But you can't tell them they're bad.

Then surely parser numbers will tell them otherwise. A global parser keeps them from getting away with it in raids, and a personal parser at least flashes their skill level in front of them, so they will either become a playertype B and actually realise how bad they are, or a playertype C in that they don't care what others think and there's no system in the world that could possibly help their ignorance.