Worst Saints Coordinator (offense OR defense) of all time

Spagnuola was historically bad.
Looing at the fullness of data across career, you have to conclude the Saints staff and the structure Spagnoulo was put in was historically bad. Spagnoulo was scapegoated. Spags left, Saints got even worse. They broke their own record for worst defense of all time in history of the league.

Spags went back to the Super Bowl and still coaches competent defenses. Better than average defenses. He's not perfect and has his flaws, but he has the results in multiple stops. The one season anomaly here was us, not him.

That's what the data say.