A nod to his potential role as a sideline-to-sideline disruptor/coverage guy in the box, like a strong safety?
I wonder if Hightower might be (perhaps exclusively) suited for an on-the-LOS role at this point, so getting Collins back effectively allows Hightower to play the edge, which should help stabilize the side opposite of Judon (especially as it relates to run defense).
I have a hard time imagining Collins will be doing much blitzing/pass rushing; not because he's incapable, but because this team has ample pass-rushers. They need a legitimate inside, off-the-ball, 3-down linebacker. Collins is now the closest thing to that they have.