RVP was supposed to make a big jump this year, but could only do so much. I noticed he was often hit with a double team and we didn't have enough others on the d-line to make plays besides Nwaneri and occasionally Pietrzak. All three of whom are young and need to add bulk to be effective against the smashmouth styles (Minnesota, Iowa, Michigan, etc.). We lack the war daddies who can plant themselves in the middle of the field and hold the line. I think Berymon would be a huge get as his build could fit that need, though we would need a few rotations worth to keep us dangerous.
IMO we have a good core of defensive linemen, though they are relatively young and need to add bulk to become really effective.