You've been witnessing it before your eyes from the moment Cameron Heyward was drafted, the Steelers are looking to bring their defensive line back to it's glory Steel Curtain days.
The defensive line, it's a tradition of great Steelers defenses. From the 1970's 4-3 defensive front of Joe Greene, L.C Greenwood, Ernie Holmes and Dwight White, to the 2000's 3-4 occupying front of Casey Hampton, Aaron Smith and Brett Keisel, great defensive line play has basically become a necessity for the Steelers. When Aaron Smith couldn't stop tearing his triceps, and Casey Hampton and Brett Keisel began to show their age, a dark time ensued for the Steelers defense.