Do you know of any tour players that use a true Strong Single Action Grip, where the pressure points line up along the longitudinal center of gravity that extends through the grip down to the center of gravity of the club?
Unless otherwise indicated the left thumb is always placed on the same line as Pressure Point #3, and covered with the cup of the right hand palm. With strong Grips, this places the Thrust of both the #1 and the #3 Pressure Points On Plane so that the Clubhead Lag alignments are established and can be verified by the Waggle and the Foward Press.