Pretty much exactly what you just said here except I think he belongs in round 2. Rotational guys on the defensive line that can rush the passer from inside are pretty important to have in the NFL. He's facing a lot of double teams this year and his production is down. If you watch the Navy game you'll see him getting double teamed against that option every snap.
All these players have different skillsets. I can have two players like Michael Bennett and Carl Davis graded very closely, but they're two completely different players. It depends on exactly what you're looking for defensively. Davis is stout at the POA and soaks up double teams. Bennett is a lighter, faster player that likes to penetrate and get after the passer.