Some interesting analysis here, cheers everyone.
The point(s) that stand out for me are that the things people are generally picking up on (and I see this same trend all the time when talking technical analysis, with both coaches and players) are the idiosyncrasies in the swing rather than the fundamentals. JMDP has pretty near "perfect" technique in the four key areas of the swing, but the way he joins those dots is unique to him.
I'm going out on a limb to say for his unique combination of physical "talents" (I hate that word in this context, but it will do), his forehand is bang on.
I tweet - @ashtennis guru (no spaces)
I Shoot - www.flickr.com/photos/ashtennis guru/ (again no spaces! grrr)