It's hard to believe that anyone in the FBI would make a personnel decision on a field agent based solely on the rantings of a gal like Jo. I suspect that a lot more was going on behind the scenes, such as the Bureau's distaste for Carr's behavior. I doubt he had many friends in the FBI for starting the Citizen Sleuths, posting on the DZ, and jumping in front of every camera lens he could find.
Dorwin had the same problem in Portland. Everybody in the office was jealous of him, according to Dorwin's grandson.