The most important alignments in the uncompensating swing.

[ChrisNZ]

BUt in the look look look picture posted above, if the shoulder s were not represented as straight, but instead as a curved or slight 'v' shape then both shoulders could be onplane. Now maybe it is not what actualy happens in the swing, but it is not a law of logic that both can't be onplane unless you assume a straight line across the shoulders.