Originally Posted by BrianW

The 4MM method does require you to start the downswing by pushing the hips forward while holding the shoulders, head and arms back at the transition. The theory is that if the hips are thrust forward they will have to rotate as they cannot do otherwise.

I prefer a single (on plane) swing where you keep more stacked throughout and do not need to push the lower body forward during the downswing. You only need the weight to move slightly onto the lead leg by moving the lead knee over your lead foot, this does have the effect of the upper body moving slightly forward and down at transition but only by a small amount. The power is then turned on as the torso and shoulders rotate and unwind around a steady spine angle. The hips will naturally turn through in support without any conscious effort

A two plane swing does require the club to be dropped down onto a lower plane in the downswing and to achieve this the lower body must push forward and rotate while the trail shoulder works down and under.

To get back to the original question: I like to use the 4MM early wrist break in conjunction with a more stacked rotary swing, this uses less moving parts and makes off plane type errors less likely as there is little to go wrong.