Though I've never heard the theory, I came to the same conclusion about the development of traditional grip since there is no evidence of it in any of the rest of the percussion family, as far as I know. Were there any inherent superiority to it, we'd all be using the counter intuitive grip with both hands.
Like Cliff, I have made brief and aborted forays into the world of matched grip either to ease of transition to cross sticking, or because of some awkward experience that left me in the matched position and unable to extricate myself quickly enough. My left hand would require intense reprogramming. Annoying, because the right hand is capable of quicker and more sustained strokes... but the left is coming along, and every now and then I can almost, almost feel it begin to free up into a genuine one handed roll.
Speaking of which, something happened to my right foot. I can now play very quick triplets and quadruplets with one foot. Don't know how it happened because I wasn't trying. It is sort of like when you dream you can fly and it's so easy, only I'm not waking up.
The double bass pedal is now useless to me.
Anyone got a single GS they don't use?