Sophomore Clarence Jackson has moved up to take D.T.
The defensive players showed their support of Shackelford by breaking down around him at the end of the workout. Shackelford watched from the sidelines on crutches. He is expected to have surgery within two weeks.
The Rebels will go through another light workout today and will conclude spring drills with the Grove Bowl on Saturday. Kickoff is 1 p.m.