jackcrawford
Professional
As to the first point, in the same way Priority 1 subscribes to the threads here about "polarized" racquets? LOLI believe tennis federations all over the world subscribe to it for their juniors, Serbs, Spaniards, etc., and it's a reason why they are now beating us at our own game.
And there is the Gordon piece on the pro fh everyone is talking about, right above mine.
As to the second, Heath Waters put out the same information ten years ago in plain Engilsh, rather than technobabble, on a couple of sites.