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

Alan12 said
This.

Rob Ryan turned that same group Spagnuolo floundered with into a top-5 defense THE VERY NEXT YEAR. No excuse regarding the roster.

Spagnuolo couldn't get sacks from anyone other than Jordan or an aging Will Smith while Ryan came in and squeezed 12.0 sacks out of Galette, who was wasting away on the sidelines in 2012. Same with Hicks.
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The team had a lot of players that were better suited for a 3-4 scheme and that’s what Rob Ryan’s scheme called for when he came over. It wasn’t until 2014 that Payton had Rob Ryan switch back to a 4-3 and replaced the safeties to try to emulate the Legion of Boom scheme that everything went to hell again.