I meant the "myth' part.
I believe that to be true, that a black belt being a Master, is myth.
I think that myth is encouraged by some schools (not necessary styles) and discouraged by others.
I also think that a person who reaches black belt in BJJ has a far greater likelihood of becoming a true master in martial arts than a person who reaches black belt in Karate. And, I think a person who reaches black belt in Karate has a far greater likelihood of being CALLED a master than a person who reaches black belt in BJJ.