Most college football players spend the summer between their junior and senior years working in the classroom, weight room and on the practice field to prepare for their last campaign. Powell spent most of his, however, grieving for his younger brother, seven-year-old Malachi Briggs, who died after battling kidney cancer. He returned to campus before the 2015 season, and played well with a heavy heart. Powell started 11 games, running for 542 yards and three touchdowns on 125 carries while having a major role in the passing game (35-212, two TD). He had started 11 games the previous season, as well, leading the team in rushing (134-618, two TD; 18-154 receiving, one TD). He also contributed as a freshman (28-93 rush, 1-4 receiving) and sophomore (62-344 rushing, 2 TD; 8-90 receiving, one TD). Powell fumbled once in his college career, versus Virginia Tech in his freshman year.