In typical Mike Tomlin fashion, the Steelers said alot while saying precious little with their recent defensive line restructuring. Personnel evaluations are a crucial part of any successful rebuilding process. Contending teams have usually built established and productive lineups. Any starting lineup or depth chart changes are often based on injuries or ineffectiveness. Personnel stability allows for team chemistry through familiarity. The Steelers are a franchise renowned for their stability. From the front office, to the coaching staff, to player personnel; changes are infrequent and, therefore, noticeable. Most substantial changes are the result of free agency losses and additions, or…