The only time that a "single boss" would know better than the team would be if the single boss was as knowledgeable about the development process as the team wa

The only time that a "single boss" would know better than the team would be if the single boss was as knowledgeable about the development process as the team was, and knew that the team was, for some reason, cooking up a conspiracy to fire a certain employee who didn't deserve it. Probably pretty rare, especially compared to the number of people who get let go because they just didn't click with their supervisor.