You bet it is! Team cohesion is a common quality of championship teams. If you start to see cliques beginning to form than this should be a warning sign that the health of the team might be in trouble.
In fact, the sports axiological profile measures this exact attribute in the External Extrinsic dimension of value making decisions. Below is a great question to ask yourself regarding team cohesion:
Are you players playing with each other or are they playing for each other?
