In my opinion, Rex is not HC material and should have stayed a DC for the duration of his career. His flaws and weaknesses have been well documented, and in my opinion, he had a very large hand in shaping the roster alongside of Tannenbaum and leading the team to its current state.
The bottom line ... Rex has grounded and pounded this team into the bottom of the league. His philosophy is outdated and his conduct as the face of the franchise is unprofessional. The sooner he is replaced, the sooner the Jets can build toward becoming a contending team again.