The defensive line is the most important unit of a football team in the SEC. If your team can't stop the run and pressure the quarterback, that defense is likely to fail, which then means that it is going to be a long season for that program.
SEC football is won in the trenches and it takes an elite defensive line for a team to take that next step. While many teams in this conference are talented up front, there are only a handful that truly standout among the rest of the pack.
It's best to build a dominant unit around one superstar, which is the formula these top defensive lines have used.