Replacing Devin Bush is a challenge on multiple fronts. There’s his obvious athleticism, 4.4 speed that’s next to impossible to find at linebacker. There’s also the dot he wore on his helmet, the green circle that indicated he was the defensive signal caller, relaying information from Keith Butler and Mike Tomlin to the rest of his teammates. Robert Spillane wore the green dot replacing Bush following his season-ending ACL tear Sunday and it sounds like going forward, Spillane will continue to occupy that role. CB Cam Sutton spoke with the media Monday and said he expects Spillane to be the defensive quarterback moving forward.