"The Steelers have a long and successful history of promoting offensive coordinators from within their coaching ranks -- Tom Moore, Chan Gailey, Mike Mularkey, Ken Whisenhunt, Bruce Arians. Three of them left to become head coaches in the NFL.

But, if Arians doesn't return as offensive coordinator in 2012, the Steelers might have to go outside their organization for the first time in 13 years to hire his replacement. And that hasn't been a successful proposition."