[purehitter]

John's description makes me think of a 4 barrel Hit with little #2 accumulator : Impact address, stiff structure but with a big dose of pivot rotation.

The stiff structure, the body rotation in the backswing and the necessity to keep the left arm connected (to feel PP#4) could look as if you take the club too in the inside. But as long as you trace the planeline it is ok (a Mike Weir type of swing).

Very interesting: a lot of power for sure but don't you have timing issues?

The connection of pp#4 happens on the down swing during the transition. The elbow position works like a brace and keeps the club head from working inside too much on the back swing. Timing is not a problem if you maintain the structure of the flying wedges and use the magic of the right forearm to cock the left wrist. It is a powerful 4 barrel swing pattern many golfers can learn with no problems. Take the back swing only to the top and the swing is easy to repeat.