Matthew Quote: However in the golf stroke the left shoulder is moving in its own little orbit that contains an upwards direction and this brings the low point backwards somewhat.
Actually, not necessarily. This would be true if the left shoulder was moving in its own little orbit that contains an upwards direction IF the left arm/club was perpendicular to the shoulder line. The fact that it's normally not- "leans forward" i.e. the arm hasn't come across the chest completely, creates an offsetting factor. Also, you are assuming that there is no other downward movement of the clubhead as a result of the wrist uncocking or any other downward motion affecting the clubhead.
I would of let this slide if you had said "for concept purposes" or if you assumed a fixed "arm - club" perpendicular to the shoulder line (don't get nit picky on the perpendicular- if you need more details I'll supply it) but this holds no such disclaimer.
Should we go on Okie? Or do you need a moment to get a beer out of the fridge?
Can you prove the above? I'm not saying your wrong . . . but time somebody says "the shoulders turn perpendicular to the spine." You say, "What are your sources?"