Can arbitrators disregard Supreme Court precedent on awarding attorneys' fees to union members wrongfully denied mandated arbitration?

QUESTION PRESENTED United States Supreme Court precedent requires that union members be awarded attorneys’ fees where the employer wrongfully blocked access to quick and inexpensive mandated arbitration and thereby forced the union members to seek a remedy in the judiciary. But are arbitrators in federal labor cases free to disregard this United States Supreme Court precedent simply because the subject Circuit Court of Appeals has not yet itself addressed the issue? i