I think you're right ... rushing the backswing or even the downswing will probably lead you to build up just a little bit too much energy in the coil, and that will cause your body to begin uncoiling by itself, starting in the wrong place - the shoulders.

By pausing at the top, you ensure that you don't automatically uncoil. You will coil less and build up less energy in that coil, but you will be able to control it a lot more.

And when you trigger your downswing by sliding (and turning) your hip, you will get that extra little coil anyway.

I'm no teaching pro, but it makes sense to me from a biomechanical point of view.

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//Mox
2008 bag:
Mizuno MX-500 460cc 10.5* Fujikura Tour Platform 26.3 stiff. (about to be replaced by MP-600 10,5* UST Proforce V2 stiff)
Mizuno F-50 3w 15* Fujikura Tour Platform 26.3 stiff.
Wilson Deep Red 5w 18* Graphalloy Fatshaft stiff
Cleveland HALO 3i hybrid 22* graphite regular
Mizuno MP-60e forged 5i-PW True Temper Dynamic gold R300 steel
Mizuno MP Black OX raw haze 50/6 GW, 54/9 SW, 58/10 LW
Heavy Putter B3-M
Titleist NXT Extreme