Why is too much talent a bad thing? Think teamwork. In many endeavors, success requires collaborative, cooperative work towards a goal that is beyond the capability of any one individual. Even Emmitt Smith needed effective blocking from the Cowboy offensive line to gain yardage. When a team roster is flooded with individual talent, pursuit of personal star status may prevent the attainment of team goals.An old friend has served as a coach for several local teams (mostly high school). He once remarked that one of his hardest jobs involved convincing highly talented, very competitive young women to work as a team. (As well as "releasing" the occasional player for not being able to "play well with others.")
I would assume that this would have some application in the business world where highly-talented, but arrogant, employees would make it difficult for the rest of a team to function well.