Its a bit of 3D puzzle. Homers basic geometry being a flat plane, with a circle laying on it. The plane shifts up and down in various manners. The clubshaft always laying flat to the plane and one end of the club always pointing at the Base Line. The Explanar is a static circle that allows the clubshaft to shift planes. Can they describe the same clubhead orbit, clubshaft? Sometimes? Never? My brain hurts.
If you look at Y.E. in the DTL and imagine beams of light coming out of the handle and the end ..........he isnt tracing a straight line. But maybe Im missing something.