...and how do we know?
This spins out of that other discussion we've been having lately. All the other Greats had opportunities to exhibit their martial arts to some degree towards the end of ROCH, but Gwok Jing fought nobody other than soldiers after his great fight against the Golden Wheel Monk and other Mongol mercenary warriors sixteen years earlier. Where did he stand among the world's greatest living martial artists by the end of ROCH, and how do we know?