The general manager goes shopping for the ingredients and it’s up to the coaches to cook the meal.
That is basically how NFL franchises are run. The ingredients, or players, are brought in by the front office and then the coaches, or chefs, are supposed to make something out of them. If either part of the equation isn’t up to standards, then you have a mediocre team or worse.
For the Green Bay Packers, general manager Brian Gutekunst has spent a pretty penny on defense especially in the last few seasons. From using multiple first round draft picks to bringing in outside help to contract extensions, plenty of resources have been spent on that side of the ball.