Haynes committed to North Carolina out of high school, but low ACT scores forced him to Fork Union Military Academy for the 2013 season before he improved his grades and wound up at Mississippi.
He was a very productive defensive end in all four seasons in Oxford, with at least 31 tackles, All-SEC honors in 2015 (16.5 TFLs, 10.0 sacks) and 2017 (11.0 TFLs, 7.5 sacks).
He showed off explosiveness at the Senior Bowl before impressing at the NFL Scouting Combine in the 40-yard dash (4.67 seconds, eighth among edge defenders) and broad jump (10 feet, three inches, third).
Haynes thrives as a pass rusher, producing 32.0 career sacks with first-step burst, lateral quickness and flexibility to threaten the edge. He flashes the ability convert speed to power with surprising effectiveness for his size (235 pounds). He hunts the ball (12 forced fumbles), is durable (played in 50 straight games) and was also a team captain in 2017.
Haynes is a one-dimensional player at this point. With a scrawny lower half, he's not at all prepared to hold up against NFL run games, regularly getting overpowered and giving up the edge. His size suggests a move to linebacker, though he has no experience dropping in coverage. He also needs more polish to regularly threaten NFL tackles as a rusher.
Haynes profiles as a 3-4 outside 'backer, but he'll likely be just a situational rusher until his play strength improves.
--Field Level Media
Career Defensive Stats