I would argue that this is deeply correlated with the reward structure. If you only have rockstars but they are rewarded must strongly due to individual accompl

I would argue that this is deeply correlated with the reward structure. If you only have rockstars but they are rewarded must strongly due to individual accomplishments they will tend to lower the team play, if instead the rewarding is more calibrated twards team achievements, then there will be much less worriying on who is getting credit for what. Thus increasing collaboration. (I am assuming that the entire team is mainly A players and Bs are filtered out, thus there isn't too much variance in individual productivity)