1. Dan Quinn, DC
Everyone's darling Dan Quinn should shoulder most of the blame for the loss. Quinn made zero adjustments and allowed Packers quarterback Jordan Love to post a perfect passer rating in his first career playoff start.
Quinn is known around the NFL for sticking to his guns. The Packers knew this and attacked his system to perfection. The Cowboys played soft coverage against Green Bay's speedy receivers and they allowed touchdowns on five of the Packers' first six possessions and 41 points in total.
Coming into the game, there was one player Dallas absolutely couldn't let beat them: running back Aaron Jones. And yet, Jones carved up Quinn's defense to the tune of 118 yards and three touchdowns on 5.1 yards per carry.
Quinn even dropped Micah Parsons into coverage on a 3rd and 9 on the Packers second drive (that ended in a touchdown), which is typically when the defensive coordinator dials up the blitz.
Matt LaFleur coached circles around Quinn. It's as simple as that. Quinn's had a propensity for coming up small in big games, but Sunday was his worst display in three years as the Cowboys defensive coordinator.