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" or Hard hitting physical player, depending on who he hits and what team he plays for)...
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.