A pivotal part of James Franklin's growth of the Vanderbilt program, Stacy was one of the most consistent runners in the country throughout his career. His best accomplishments might actually be off the field, as Stacy majored in Special Education and frequently volunteers with local charities to do his part of community service. The senior did hit some rough patches as a freshman and sophomore, failing to finish those two seasons due to injuries, an ankle issue in 2009 and a head injury in 2010.
A three sport athlete in high school (baseball, basketball), Stacy immediately contributed to the Commodores as a freshman, starting four games and rushing for 478 yards and three touchdowns on 107 carries. He added another 72 receiving yards on seven receptions. Stacy missed two games that season and was limited in another two. As a sophomore, he rushed for 331 yards and three touchdowns on 66 carries, with another 32 yards on nine receptions. Stacy missed the final three games of the season. During his junior year in 2011, Stacy finally earned a full-time starting role and it paid off for the Commodores, rushing for 1,193 yards and 14 touchdowns on 201 carries. He added 106 receiving yards on 20 catches. Finally, as a senior, Stacy took 207 carries for 1,141 yards and 10 touchdowns. He added 10 catches for 205 yards.