Kane Wommack has done excellent work in his two years as Alabama's defensive coordinator. He's grown a lot during the time, perhaps none more so than his willingness to be uncomfortable as a defensive play caller.
Wommack's preference is to drop back into zone coverage and force offenses to nickel and dime down the field, banking on his defense to make plays that keep the opponent out of the endzone. Against Oklahoma in the opening round of the College Football Playoff, that wasn't working.
The Sooners scored 17 points on their first four offensive possessions, forcing Wommack to get aggressive in response.