[Yoda]

So why would Mr. Kelley not quarrel with a player mixing the Standard and Single wrist actions?

In Single and Standard Wrist Action, the Hosel and the Sweet Spot are both On Plane at the Top. However, during the Start Down, the Hitter's Clubshaft -- and Hosel - immediately begin to rotate around the Sweet Spot as he applies the Roll of Angled Hinging in his return to the Ball (10-18-C-2).

With the Swinger's Standard Wrist Action, the Hosel and Sweet Spot remain On Plane during the Start Down as he applies his Left Hand Karate Chop to the Ball. This helps the player whose sense of Clubhead Lag -- Sweet Spot inertia -- is underdeveloped and who therefore tends to start the heavy Hosel toward the Ball (instead of the Sweet Spot). In other words, Standard Wrist Action serves the less-skilled Hitter as Anti-Shank insurance.

But remember, in my prior post's reference to the use of Standard Wrist Action in the Start Down, I bolded the word initiate. As soon as the Sweet Spot has begun its Down Plane journey and the Right Shoulder Turn has taken up the initial Clubhead inertia (Lag) and begun the Power Package Acceleration, it is time for the Hitter's Right Triceps to assume command and begin his Simultaneous -- not Sequenced -- Release.