Entering the NFL Draft, Jefferson was a highly regarded linebacker from a big-time program in Texas. He finished his college career with 231 tackles (26 for a loss), 13 sacks, two forced fumbles and five passes defended. His stats really took a jump in his senior year when he finished with 110 total tackles.
Jefferson followed that up with a productive Scouting Combine (even if it was hell to deal with). He finished near the top of the linebackers in the 40-yard dash, broad jump, and he put up 27 reps during the bench press.