DariuszNow, you stated "why not" - which means that you can imagine that the cluface sweetspot can be on a different plane than the back of the left wrist/hand at this time point.
To me, that means that you really do not understand the relationship between left hand movements and the clubface. If the clubface was not on the same plane as the back of the left wrist/hand at this time point, then the left wrist/hand cannot be flat - it would have to be bent. In my mental universe, the left wrist/hand must always remain flat throughout the entire swing. If the left wrist/hand always remains flat and the clubface is always exactly in a straight line relationship with the back of the flat left wrist/hand, then the clubface must always rotate at the same rpm as the back of the flat left wrist/hand.
Jeff.
Jeff, you are right, I don't understand what trigonometric influence on wrist flatness can make an inch of distance between the hosel and the sweetspot when comparing to 40 inches distance between the wrist and the clubhead.
Enlight me, please, but I still think you are missing the big picture while concentrating on not important details that usually darken this picture.