2. J.J. Watt
Before Aaron Donald came along, J.J. Watt was the most accomplished defender of this generation, hands down. Despite missing a total of 32 games over the last four years due to some serious injuries, Watt has somehow thrust himself back into the conversation among the top d-linemen in football. Now 31, Watt is back playing at a high level. PFF gave him an elite 89.6 grade last season.