The MD80 works with trim tabs to control the control surface. What if AA587 lost it's rear lugs on the VS and the rudder was giving opposite commands of yaw. Right rudder, left VS, giving the rudder the function of a control tab? Could you control an airplane on a moments notice using right rudder to yaw left? Just a thought, I have always thought the front lugs failed first which would cause the same crash but in a different way. Rudders alone, I don't think so.