I completely agree, seeing as your Aikido joint manipulation techniques are similar to our Kung Fu Chin Na techniques. Pressing the wrist in, towards the opponent, weakens the grip and can cause injury to the joint. We have a technique that would destroy a mans wrist if one was able to apply it from the position of a gun grab. We use something similar to this, at 2:12http://www.youtube.com/watch?v=KZx9gF9d6N8
Only we compress the wrist down with the right hand while holding the elbow up with the left.