[Daryl]

The left wrist only needs to be flat @ impact or slightly bowed. Once the ball has been fully compressed and the club enter's the ground it does not matter what happens next. As Hogan's core turned hard after impact the hands worked left and inside.

It does Matter. It matters a great deal. Please Allow me to explain.

We all agree that at Release, the Clubhead speeds up. It may speed up to 100 plus MPH; again, agreement. Much faster than the Hands; agreed. If you release too early, then the Clubhead will probably pass the Hands at or before the Ball is Struck if you try to Roll the Hands - agreed?. This Bends the Left Wrist, agreed. Then you have lost the Three dimensional Impact and have lost Clubhead and Clubface control. Are we in agreement? Therefore, you cannot adjust the ball flight and trajectory without gobbs of compensating manipulations. Pro's have such a hard time controlling the Ball Flight, they stick with one shot and play courses that SUIT THEIR GAME (Hackers).

If the Clubhead Passes the Hands a millisecond after Ball Separation, where you suggest does no harm, the cause began back at Release. The Clubhead is overtaking the Hands, but not with Rhythm, not with the same RPM.

You are only teaching your self to throw the clubhead and clubface. You are only learning Hand-Eye coordination.

Hogans core turned hard after Impact??????? Gibberish. NO MORE SO than any good golf swing would - as an automatic result of an On Plane Impact on the Elbow Plane. If you think otherwise, then you're listening to those Voodoo Witch Doctors on the Left Coast.