The Pittsburgh Steelers will count on several names to replace Stephon Tuitt. Javon Hargrave steps into a more prominent role. Tyson Alualu will be his “official” replacement in the team’s base 3-4 defense. Count Vince Williams as one of those men asked to fill Tuitt’s large shoes. On the surface, he’s an unlikely candidate. An inside linebacker, 100 pounds lighter, who isn’t going to mix it up with a guard the way Tuitt has bullied linemen this year. But Mike Tomlin sees the value he brings as a pass rusher to the defense.