I actually took a very interesting class on the psychology of elite performers. Teamwork IS important because the whole team focuses on a common goal rather than the individual. There are 4 stages to group development:
It's only in performing when guys will lay themselves on the line for the good of the team and ignore personal gripes. You'll notice all of the best teams have an immense team cohesiveness. Perpetually bad teams have low team cohesiveness. It's amazing how simple it really is.
Part owner of the 13-time world champion Green Bay Packers