I think you missed the point(s)
:
"Although knowledge in book appears sound, not all of the example photos are. On page 17, it shows two pictures at the bottom; with what appears to the author Dennis Rovere; Leaning his torso forward, and extending his head. I do not do this, nor do I recommend it, since it causes one to be less rooted, and more committed to a forward motion. One who is skilled will see this forward leaning and lead the person with their own energy. I do not see this in the photos of the old time practitioners."
To respond: If you read the text and the captions: I am not illustrating a xingyi punch but rather showing how the body has to absorb or can redirect the force using the half turn position. the 45 degree angle of the torso lets the strike aimed at the centre line simply slide past. If you look at the section on peng quan my position is not leaning nor is my head extended.
"Before the forward hand is thrust out and downward (splitting-chopping), the opposite hand should be raised up vertically; as in the uppercut in Water. This is not done by Rovere in his photo on page 16; Figure2-3m1; the two hands are on a near horizontal plane; rather than increasing the angle to a closer vertical relationship."
To respond: Do you know what horizontal means? My lead fist is pointed up and greater than 90 degree angle as is the back hand. Too vertical and the arm will collapse if you push against it. I suggest a course in mechanics in order to help you better understand angles of force. Horizontal refers to parallel to the ground (x axis in space); vertical is up and down (y axis in space). You need to rethink your comments.
Since I actually trained with the "old time practitioners" I think I have a pretty good idea of how to do pi quan.