I don't know this for a fact... but from what I've heard from different outlets is he just doesn't want to be there (in Jacksonville). Also, they are changing from a primarily man-coverage defense to a zone-heavy defense, and he's a man cover corner.
So maybe the scheme is the reason why he wants out, or he just may not want to be a part of the organization. Again.. that's what I've gathered from different things I've heard/read.