So, how the heck did Marlon Mack of all people rush for 139 yards against a stout Dallas defense in the Cowboys' first shutout loss in more than 15 years?
Former coach and scout Glenn "Stretch" Smith says it was a matter of about six inches in the defensive alignment.
Watch the video player above for a breakdown of the simple adjustment the Cowboys could've made to stop the Colts running back's big day.