so from what i have read up on dk tanking, most guides or recomanded talents say that tremble before me is a bad talent choice, yet tightening grasp doesnt really add much if you are already able to control the mobs and place yourself correctly. does tremble not work on trash mobs in mythics? at current they seem to do the most unavoidable damage for tanks in general and as such if it does work doesnt that make it better?