here are the depth charts for each team and its the damnest thing I've seen. Either alabama is shooting testosterone or they are recruiting kids straight from Judges 16. I looked at LSU's depth chart and it is nearly identical to clemson in height and weight.
They run a base 3-4 and bigger linebackers in the middle are usually necessary but 270lbs?! Obviously a well coached team but they are playing with varsity players and everyone else is jv. You'll also notice only juniors and seniors start on the defense