2. Peppers did not have a dropoff like Clowney did, and you are gonna have to prove that John Abe did before your point is factual.
1. Year to year improvements in Olines, changes in coaching staffs, accumulated film, change in O scheme, changes in Clowneys support on D, off the field issues to deal with, Clowneys change in goals, nagging unreported injuries, changes in off the season conditioning, more maturity from Clowneys, different treatment from the refs, the list of variables you can't see in a box score is pretty endless.
Comparing one year to the next and using a boxscore and not atleast game film is not a good way to draw absolutes.