Ah! I see your cognitive issue now: you don't grasp the basics of a three front defense. Here's the deal. The three guys up front "plug and steer" forcing runs outside. Any sacks are designed to come from blitzes.
This is a gross simplification but captures the essence. Monty's guys did a credible job at their responsibility. Our failure to blitz falls on the guy calling the defense.
We'll be lucky to get a coach any better than JM