I was a long time advocate of Manuel and met him in person when he did his yearly clinic here in Phoenix. I was also a student of his predecesor David A Williams who teaches down here in Phoenix.
Manuel is a terrific guy with a very simple concept of the swing. However, it doesn't have to remain simple if you don't want it to. He, I, and David once got into a conversation about there being the different swing centers. The center which we consider the axis of the swing, the halfway point going back, and the halfway point going forward. They are each significant for Manuel.
As far as the upper arm swing, Manuel does not subscribe to the "Kinetic sequence". He believes the lower body facilitates the action of the arms but doesn't not initiate it. If you want more speed, swing the upper arms quicker. So long as you don't try to manipulate the club then the clubface will close by itself as "centrifugal force" tugs on you and your arms extend back to their original position.
Manuel also wants the ball back more toward the center of someone's stance, even for woods. As he puts it, the clubhead should be directly in the middle, and the ball should be just in front of that. In the older days when taking spin off the ball and trying to hit with an upward swing path wasn't the ideal, this worked for him and others.