[yodeli]

Perhaps helpful to think of it this way - The #3 accumulator is the 'rotation' (roll) of the #2 accumulator angle with the left arm flying wedge (left arm/club line) as the 'hinge' around which that rotation happens. The larger the #2 accumulator angle (more left wrist cock/lower hands at fix), the more potential power, but the more precise Rhythm (rate of rotation) must be and the earlier the release needs to be.

Thanks Edz for this clarification.
I just found also interesting informations on this in 4-D-0:
The #2 Acc. uncocks and #3 Acc. rolls - These are related to Wrist Motion and Hand Motion - coordinate but very independant.

And another very interesting regarding Hitting and Swinging: "The Hitter concentrates on Hand Motion (#3 Accumulator), while the Swinger concentrates on Wrist Motion (#2 Accumulator)" (Text in Bold Italics added by me).