Thanks for the insider insight and a detailed thoughtful post.
Personally I hated Rex- because he made the Jets good and rubbed it in our noses.
Aside from the loyalty issues, meddling ownership and poor drafting, I'm curious why you didn't mention the beginning of his downfall (IMHO) that being the departure of Brian Schottenheimer. HIndsight is 20/20 but he made the offense work and it was never the same (nor the team) after he left.
As for loyalty being a fault, I hate the CEO cuthroat mentality. I like extending the benefit of the doubt for players who have produced for you- within reason.
If Mark Sanchez ever shows up wearing the blue and white then clearly loyalty to a fault- a very big one.