The first question to ask about any free agent.

[*wildcats forever*]

I have to believe when a player chooses to test free agency, it's either money (like TJ Housh.) or a confidence issue (like Carson) with the team he's thinking about leaving. Teams letting players go boils down to declining performance tied in with cap hit, or just not wanting/being able to afford paying top dollar. Then there are the locker room cancer guys, who might be a good talent but not worth the trouble they cause.