ANY onplane backstroke nessesitates the right forearm to lift the secondary hinge in the hinge assembly located at the left shoulder. As the pivot turns, the right forearm lifts up the primary lever assembly and it does this by using the plane line as its guide (tracing along the plane line).
If their was no right forearm 'pickup' on the entire backstroke as the pivot transported the power package, the clubhead wouldn't get 3 foot off the ground if your lucky and would create a very bent plane line.
The ideal is to always maintain its relationship to the plane line, just like it is ideal for a snooker/pool player to maintain the cue on a line straight back and straight through (usually on a vertical plane). With the shoulder turn takeaway - you lose the precision and then you are forced to pick up with the right forearm later in the golf stroke and try to re-establish the plane line. Bad snooker/pool players take it offplane or off line and they usually can never re-establish it - just like it is for hacks at golf...
It has absolutely nothing to do with not cocking the right wrist. It has everything to do with the all encompassing, imperative maintainance of the inclined plane. Those who do not teach the right forearm pickup, do not really teach plane.
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