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

BreesusSaves said
The Saints had a defense lacking talent and terrible position coaches and no Head Coach. Spags was never given the chance to actually rebuild the defense here. It's that simple.

That! I think that Sean should have given him a real chance, after the previous year , where the NFL didn't want us to have a winning season at all

Saints 318 said
the players on defense that year was very bad

Bad? Greer, Vilma, Smith, Jordan, Wilson, Galette?