This means that if they do not help others the job will often not get done. If skilled people get irritated enough they will not help coworkers. This is why skilled people often dislike teams and equal profit sharing. They are not equal, the value they deliver to a business and its customer base is greater than other employees. And they know it.
Skilled employees place great emphasis on the work environment and their teammates.
If attitude does indeed determine results this could be a key to determining potential skilled employees. I use this question in almost every interview. They know their needs and have a plan to meet those needs. The skilled have enough interest in their work to read and study when not on the job. The skilled derive satisfaction in what they do.