Chief Khan's behavior is similar to that of manager's that are very insecure in both their ability to lead and manage. Behaviors such as making major changes immediately upon taking responsibility...of an organization that by all estimates was not just good but exemplary. These included staffing changes which under a new leader is natural but they usually only include direct reports and personal assistants. They rarely include trainers (Brunacini's sons John & Nick) or vehicle repair staff (Brunacini's best friend Hoot Gibson). Finally, a third strike against Chief Khan in my eyes are these seeming sweetheart deals to friends and advisers (Mr. Compton, Mr. Compton's assistant, and potentially Mr. Cantelme if talked about ambulance services get changed). While these are alleged to be legal(though without Ass.t Manager Washington's input are unable to be corroborated) the best leaders go out of their way to avoid all appearances of impropriety.
These facts while not necessarily indicative of Mr. Khan's leadership of the Phoenix Fire Department are frequently indicative of an insecure leader. A leader who needs to make wholesale changes and court favor from others who more often support to disguise their currying favor. All to shore-up a weak ego, weak management skills, or more likely lack of confidence in one's ability to lead.
It is unfortunate and saddening that what Chief Brunacini and the firefighters of the Phoenix Fire Department built over decades was so quickly dismantled. I feel what's sadder still is the relationship that the Brunacinis'; Mom, Bruno, John and Nick built with Bob Khan over decades was just as quickly dismantled.