The problem with both the points above. 1. He never had agro to start with. 2. Defensive bonus is irrelevant, multiple deaths caused by enmity chopping between players is bad enmity control and like it or not the tank has the tools or more than any other job to control this. The fact that this tank and tanks in general don't take charge of enmity is the definition of bad tanking. It also brings the group's dps down as a whole as well.