You would be shocked if you knew how many incompetent and mediocre individuals work with professional sports teams. It is the rule, rather than the exception. Part of the problem is that the people who are in a position to hire for these positions have no clue who is good and who is not good. A lot of the time, they go on the referral of someone else or they go with someone familiar to them. There are rarely exhaustive interview processes in front of an expert panel or committee for these positions.