[Daryl]

According to the spine engine theory, the hip has a gear function. A function that translates a linear motion of the feet to a rotary motion of the upper body. In my book that is hip action. In McIlroy's case it seems to be more sequeced than in most other strokes though.

Maybe I'm mistaken, but I didn't get that from the Article. Maybe the Hips are engaged? The following is a quote from the Article. He does say that the Tailbone moves before the legs. But then he says that the "Spine's gears drive the Rotation".

But from the back view you can clearly see that the spine engine is the initiator of the action. His sacrum or tailbone moves far before the legs move. The legs are only expressing the motion of the spine engine in Rory’s swing.

From the back view it looks like the spine engine is driving the swing in one big firing.

But it can only do this IF there is the necessary lateral bending and lumbar lordosis (from spine engine article draft…email me if you want a copy of this), the spine’s gears drive the rotation during the entire swing.