2. Sean Lee, LB
If there was one player capable of doing it all on the Cowboys' defense last decade, it was former linebacker Sean Lee.
A second-round pick out of Penn State in 2010, Lee quickly became the leader of the Cowboys' defense in his second season, and their most important defensive player not named DeMarcus Ware.
In his career, Lee registered 802 tackles, 59 tackles for loss, 14 interceptions, and five fumble recoveries. He was twice named to the Pro Bowl in 2015 and 2016 and was a first-team All-Pro in 2016.
As a leader, it was easy to see how much No. 50's impact made the defense better when healthy. The only downfall of Lee's career was playing just one full season in his 11-year career.
While the defense is the team's strength today, Cowboys fans won’t argue with having the former Penn State product back on the field, especially given the lack of experience behind Leighton Vander Esch and LVE's injury history.