I think some people get into the mind set of this or that. Steve, you stated grappling is "grounded in solid bio-mechanical principles." This also true of good Wing Chun as well. I believe this is true of any decent martial arts training. It is also key in being able to appreciate what a person from another martial art, or perspective, is doing to work thier system. If a person's structure is weak, it will be taken advantage of by a good grappler, striker, whatever. It is refreshing that our discussion in this thread has mostly started from that understanding.