[12 piece bucket]

Just keep in mind that the Left Arm and Clubshaft Rotate as a single unit together (#3 Accumulator motion). For a Swinger, the Swivel may facilitate the #3 Accumulator Roll (the swivel helps keep the Clubhead on Plane by preventing a bent Plane Line), but the Swivel is not #3 Accumulator.

About #4 Accumulator.

Consider the Power Package. The Power Package moves as a single unit. The Power Package must be moved into the Release Zone in-tact. This will cause the Left Arm to move down the chest as the Right Elbow moves down (as determined by the Right Shoulder).
The Left Arm (Straight Line Delivery Path of the Hands) operates on two Planes of Motion. Vertical and Horizontal. The Vertical Plane of Motion is controlled by the Right Elbow Location (Power Package Delivery). The Horizontal Plane of motion straightens the Right Arm (Release) but does not destroy the Power Package.
The #4 Accumulator works on the Horizontal Plane of Motion. This way, Hitting or Swinging, the Flying Wedges maintain their geometrical alignment. If the #4 Accumulator goes Vertical, the Flying Wedges are ruined, because the Elbows spread apart which affects the Bent Right Wrist, etc.
So, the Beginning of the #4 Accumulator Release is when the Left Arm starts moving away from the Body on a Horizontal Plane and the Right Arm begins to Straighten. The End of #4 Accumulator Release occurs when Both Arms are Straight. The total Distance (not counting shoulder movement) is only 6-9” (the amount of right elbow bend).
The Release Interval is surprisingly fast. If we could slow motion the downswing from Top to Impact to 10 seconds, the Start of #4 Release is about the 8th second, #2 about 8.5 and #3 about 9.

Daryl . .. are you saying you release #4 HORIZONTAL . . . parallel to the ground?

Lost me . . .