As it typically is with the Pittsburgh Steelers in free agency, one of the more enigmatic franchises in the NFL went about its business in free agency with the cloak-and-dagger approach. They signed two free agents to contracts in a hurry after the initial flurry of free agency subsided, and prior to it happening, nobody really knew anything about it.
Funnily enough, the two players known to have gone on visits to the UPMC Rooney Sports Complex in Pittsburgh during their free agency runs did not end up signing with the team, those being wide receiver Matthew Slater and safety Michael Thomas, both of them primarily known for special teams.