One of the Pittsburgh Steelers' mantras is, "we don't have backups, we have starters in waiting."
This philosophy is one of the reasons that the Steelers are prepared to handle the injuries that come to every team, because the guys that are not the starters are still preparing and practicing as if they were starters.
One of the down falls of this, at least for some of the players, is that if you are not playing up to "speed," the guy on the depth chart behind you is ready to take your position.
That is what has happened to starting left guard Chris Kemoeatu. Due to his struggles over the last few weeks, Mike Tomlin has decided to make a change to the offensive line and demote Kemoeatu in favor of Doug Legurski.
Likewise, here is a list of players that are in the process of playing their way out of the Burgh after the 2011 season.