Carnell Lake

Just read in the paper today that former Steeler Carnell Lake was hired as definesive backs coach.  I wonder if Tomlin is going to make any more changes to his staff.  I think they need to work on their secondary (need a back up to Polamalu who is as good as or closer to his level) and to work on their special teams a bit, but not sure the coaching staff is the problem there.