Andy and All,
This isn't news because you and I and Vic have discussed it before, but to me, revealing what 3D data can actually tell us--in all it's overwhelming quantitative glory--is the next step in understanding the strokes.
I don't mean the teaching systems that are based on it, or derived from it, or justified by it. I mean the data about racket head speed, speed and position of the body parts--all that stuff at all the important moments in the swings.
It's one thing to make a claim about teaching. It's another to have a data base that can be examined. This, as I think we also discussed, is one of the things our foundation is developing as well.
There are other people out there like Bruce Elliot and Brian Gordon. Obviously this is the goal of creating the stroke archives on Tennisplayer as well--even if purely qualitative they are phenomenally deep.
What I think is that every point of view, system, etc that claims to be based on data can ususally be interpreted in several ways. Others that aren't may lack reality on many points. These are the things we should be striving to examine together even if the end result is an agreement to disagree.
But I don't think it's necessarily in the best interest of the game for all that information to remain hidden or strictly proprietary. Again, that can be a matter of opinion and/or disagreement.
John Yandell