[EdZ]

Maybe the answer is in 6-B-3-0-1 THE FLYING WEDGES.
"The precision flying wedges assembly and alignment ... is mandatory during the entire motion."
Keeping the right forearm plane doesn't the swivel just happen?

On another note since the precision Flying Wedges is mandatory why doesn't it put them on par with the 3 imperatives?

To a certain extent, one might argue this is a chicken/egg type question.

The Flying Wedges concept is absolutely a key, fundamental concept in TGM. Perhaps one of the single biggest 'simplifications', especially when combined with the concept of extensor action and proper wrist/hand positions in 5-0. A true "short course" in learning.

That said, you can obtain the imperatives without maintaining both wedges. One of the areas that I think determine hitter vs swinger trends in a given player is the degree to which their motion is more left wedge, or right wedge.

Remember, Homer didn't 'recommend' any particular pattern as being better than any other "except on the basis of mechanical advantage". Maintaining BOTH wedges, is certainly more of a mechanical advantage than only maintaining one.