Still not 100% on the question bucket but my take on this is:
If you use 10-2-G then youre gonna have a bent LW and so you had better leave it to centrifugal force (a true swing) to bring clubface into alignment and not try to manipulate a flat left wrist. As mentioned in 10-18-B any double cocking of the LW destroys the Left Arm Flying Wedge.
By "Geometric" flat left wrist when there is actually a "visual" bent left wrist he means the left wrist isnt actually flat its bent but the clubface and primary lever assembly is aligned at impact as if you had the recommended FLW due to CF.
With 10-2-D you have set your grip at impact fix with the left wrist turned which can cause left wrist bend. The amount of bend should remain otherwise if you manipulate a FLW it will close the club face. Also beware of using too much acc #3/roll or horizontal hinging with this grip or you'll hook it off the planet.
Most people in the UK have been told to have this really strong left hand grip at least 3 knuckles showing and they wonder why they cant get a FLW at the top. Teach them to have a flat left wrist at impact and they soon get the hooks. 10-2-B is the answer unless you want special types of shots.
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