Could the Eastern Heretic have been Japanese?
The other 4 Greasts all came from famous martial arts schools/families, but we know next to nothing about WYS background.
If a school/family existed in Eastern China capable of producing such a martial arts prodigy surely people would have known about it.
WYS personality and action also gives hints.
His drive for perfection seems very similar to the Samurai way.
His disdain for Chinese conventions indicates a foreign sensibility.
Although he professed some patriotic sentiments he did very little to oppose the Mongol/Jin invaders despite his formable martial arts and intellect.
Could the hostility from other characters be a sign of racial discrimination as well as disapproval of his personality?