[Yoda]

I don't understand why you would adjust the grip different for 12-5-1, 12-5-2 and 12-5-3?

Actually, the major alignments of the Strong Single Action Grip (10-2-B) do not change in the Basic Motion Stroke of 12-5-1. The Left Hand remains Vertical; the Right Hand remains Vertical; and both Pressure Points #2 and #3 remain on the aft side of the Clubshaft and On Plane. There is, however, a distinct difference (from the norm) in the alignment of the Clubshaft with the Left Arm. This is done deliberately and for a dual purpose.

With the Club located normally under the heel of the Left Hand, any Turn and Roll of the Left Wrist causes the Clubhead to 'travel' as it seeks to maintain its In Line condition with the Left Arm. This is not Lever Extension (the shortening and lengthening of the Swing Radius via the Left Wristcock). Instead, it is Rhythm -- the true Overtaking Action (of the Hands by the Club) during the Release Interval ('Through the Ball').

Conversely, when the Club is gripped in the cup of the Left Hand (or, alternatively, when the Left Wrist is fully Uncocked), any Turn and Roll of the Left Wrist actuates only the Clubface (and not the Clubhead). Thus, the Overtaking Action with its Clubhead travel and Rotational Power (4-C) is eliminated (6-B-3-A). And this, by Basic Motion definition, is our objective in a One Accumulator Stroke that uses either the Left Arm or the Right as the sole Power Source.

Also, the Basic Motion of 12-5-1 introduces Hand Motion (Items #20 and #21), i.e., the Hinge Action (Clubface Control) and its Rhythm (Left Arm and Clubshaft remaining In Line). With Zero #3 Accumulator, all three Hinge Actions have identical Clubhead travel distances to the end of the Follow-Through (Both Arms Straight position) and hence, identical Rhythms. This allows the player to focus only on the Left Wrist alignment necessary to produce the desired Clubface Motion without concern for Clubhead travel differences.

So, to limit Clubhead Power and to simplify Clubface Control, Accumulator #3 is eliminated in the Basic Motion.