There are also some that teach people to start off with a tilt of so many degrees(at setup). Others advocate the HANDS MORE AT MID-BODY, AND THE SHOULDERS AS LEVEL AS POSSIBLE AT ADDRESS(Reverse K vs. Tripod).
Also... do you see a correlation between those that bend over more at setup(down the line view), with less axis tilt(face on view), and those that stand taller, with more tilt(Mac O'Grady vs. Davis Love)?