The move earlier this month to sign former Bengal Brandon Johnson and move him to outside linebacker, coupled with today’s activities, suggests, plainly, the Steelers don’t feel their current situation at outside linebacker is what they want going into training camp.
OLB Jason Worilds missed much of minicamp due to a wrist injury, and OLB James Harrison held out of some of the sessions with a back injury (concerns lingering from last year's surgery). None of these incidents suggest anything on their own, but that's a lot of one position to take a look at so closely together.
Worilds is in a fairly important year, as is OLB Chris Carter. Worilds got on the field a bit last season but did not play at the level many feel Steelers linebackers should be playing. Carter got considerably fewer snaps, almost entirely due to a depleted position ravaged by injuries around mid-season. Johnson's addition on the outside, as well as the flirtation with two other players at that position, could be a message to both Worilds and Carter that their roster spots and roles are by no means guaranteed right now.