He's an "in the box" Safety/LB hybrid that plays the run, and is more enforcer than coverage guy (he also has a reputation for being a "dirty player")...
My guess is this move was made because CGJ will be in the concussion protocol for a while... His skill set translates similar to the type of role that CGJ was playing.
Just a guess though, and hope CGJ is back sooner than later.
I hope so too. We'll see if he's DNP or LP today. If he's DNP, then there's a much better chance of him not playing this weekend since it's a short week. The polar opposite of the circumstances surrounding Cook's concussion.
Regardless though, Swearinger is an upgrade over Green and this could be because of Vonn Bell's injury more than CGJ too. We'd signed Green as the depth with Bell out. Difference here is Swearinger has actually played pretty well in the same role as Bell and CGJ where Green hasn't.