I would think Maranelli as DC would improve it highly. But you can't improve a defensive line in one off-season. Its just not gonna happen. This defense was only going to get better if guys played to their potential(Bruce Carter, Claiborne) or if guys started to progress and stay healthy(Tyrone Crawford). They're not big names. But before they look to improve anything they need to see what they have and see who they need to move on from.