Put yourself in A J shoes during the scandal. The big question is when did he know. Assuming it took a while for him to know and the players did not heed his request to stop he has zero options. Go public and anger all players by betraying clubhouse confidentiality, at which point he’s finished as a manager, or continue to lobby for them to stop. To this day he has assumed responsibility without pointing fingers which is why he is still respected by the players if not all fans.