The triangle is lost in a sense during the backswing as the right arm folds. The bottom line is, basically I think there are 2 key positions of the backswing.

1) When the club is parallel to the ground the shaft should be parallel to the target line and the club face should be at the same angle as the spine angle. If you achieve this you are probably not rolling the arms.
2) When the arm is parallel to ground, there should be about a 90 degree angle between the shaft and the arm. Extending the shaft down to the ground should point just inside the target line.

Conceptually, I guess, the idea of CASH may lead to more fluid movements than the idea of everything moving together leading to a more stiff takeaway. Maybe some of the pros could comment. Mike.