It takes more than smart people to succeed. It takes smart people who have the interpersonal skills for creative collaboration

Groups that avoid conflict won't be able to face tough issues or handle the creative conflict that generates new ideas.
Groups that are highly competitive won't share ideas and build on other's ideas. People won't share the credit for success, further decreasing the chance for creative collaboration.
Groups that defer to a person of higher status will miss many good ideas, and fail to tap and develop the talents of the entire group.
Groups that haven't learned to work well together will take the first workable solution to avoid unsatisfying and uncomfortable interactions.