In the setup, Austin teaches the reverse K position, in order to place the rear hand on the club without reaching around and opening the shoulders excessively.
Austin's hip action is a direct result of his leg action, and thats how he teaches it. On the backswing, the rear straightens, the lead flexes, that causes the hips to tilt, which in turn pulls the lead shoulder down, then to get the rest of the shoulder turn, the shoulder blades move away from and closer to the spine.
The downswing is started by the lead leg straightening, the rear flexing, reversing the shoulder action, the rear shoulder moves down, its impossible to swing OTT with that action. Once the weight is on the lead leg/post, the rear knee is moving towards the ball, giving you the rotation to through the ball. The leg and hip action makes it possible to keep your head very steady, with little movement, and is something he stresses.
The hand action is where Austin can be considered to be different from most instructors, notice i said most. Brian's twist away is right on target. In fact, when i went to see Brian, he told me how i was using my rear hand wrong, and described how my rear hand should work to get the results i want, its exactly the same as Austin teaches, from address to impact, where its different is from impact to follow through and finish. In TGM lingo, its verticle hinging, and I'm sure many would say its scooping, I had my doubts and contentions about the hand action, and in fact i posted a few questions to you guys for your opinions, but i think only Brian answered them, and actually reinforced things Austin (when i say Austin, I am also meaning some of his instructors) explained.
The throw from the top is another place Austin seems to be different from standard teachings, Mike sees the golf swing more of a throwing action rather than a hitting. And from his results, who can say he is wrong? The rear wrist bends as Brian says, then the rear forarm rotates, this has the face of the club as close to perpendicular to the clubhead plane line/ target line as possible, the throw is simply the unwinding of the forarm to try to keep up with his dynamic pivot.