Why did Spagnuolo stink as Saints' DC? (merged)

I don't know about now ... but back then, Spagnuolo's defense was heavily dependent on having the right kinds of players. Specifically, his defensive front seven had to get consistent pressure on the QB with only four rushers. Spags was like the anti-Gregg ... allergic to blitzing. Without having four studs up front, the rest of his Spagnuolo's scheme fell apart.