The real question should be, "Is it worth arguing about"? NF 7.2.6 explains what is necessary to legally shift, and 7.2.7 explains what is required for a player to be legally in motion. Illegal motion violations relate to the actions of a single player and relate to the timing and direction of the action taken by that player.
Illegal shift violations, normally relate to more than one player moving at the wrong time or in the wrong manner, although they do include the actions of a single player who may have either started his movement improperly or failed to complete it as intended.
Both are live ball, 5 yard penalties and the difference between the two is based on the conprehension of the rule differences of the covering official.
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