I have called JB a lot of things over the years both positive and negative and I don't think I have ever used the word Coward until now.
There were no favors exchanged. The university paid him to do a job. He didn’t do them favors by doing it, they didn’t do him favors by letting him do it. It’s business.
If he’s not ready to retire, it’s on the university to fire him. He doesn’t owe the university anything in this regard. I don’t think this is cowardice.