Basically, this rule is just that: the more people that attempt something, the less competent they become at accomplishing said task. Inversely, ventures made solo, especially in the case of Last of His Kind on a mission, are almost sure to succeed (unless there's An Aesop about teamwork). Also note that this can specifically be invoked as An Aesop, generally when something straightforward starts to involve too many people and therefore ends up A Simple Plan. As An Aesop, it contrasts well with Stone Soup. In almost all cases, it ends up being a cause of [[Stop Helping Me]!]