He worked his way into the starting lineup as a true freshman in 2010 and started nine games as a fifth defensive back, recording 65 tackles, 7.0 tackles for loss, 2.0 sacks and a pair of interceptions.
Jefferson started 12 games as a sophomore in 2011, finishing with 74 tackles, 7.5 tackles for loss, 4.5 sacks and a team-best four interceptions, earning All-Big 12 Honorable Mention honors.
He elevated his game to first-team All-Big 12 credentials by leading the Sooners with 119 tackles, 3.5 for loss, two interceptions and three passes defensed in 2012.
Jefferson isn't considered an elite prospect for the next level, but has top 50 potential because of his natural awareness, defensive motor and football IQ.
He didn't disclosed what grade he was given by the NFL advisory committee, but said, "it was cool."
Weaknesses: Lacks ideal bulk and strength for the position and needs to clean up his tackling technique. Has a tendency to duck his head, too often leading with his shoulder (or worse, with his crown), with ballcarriers occasionally bouncing off to gain extra yardage. Comes in a bit out of control, lunging at ballcarriers and giving quicker opponents opportunities at cut-back lanes.
Compares To: Abram Elam, FS, Kansas City Chiefs