Inside every team, there are two wolves...
Successful military organizations understand this. A fire team is exactly the size it needs to be for the simplest purposes. Two fire teams make up a squad, which is the basic unit of land tactics. A battalion will have resources and knowledge that are not included in the team or squad. The team and squad leaders will prefer to train independently first, then as part of larger formations. The team will be much smarter than the battalion about the particular place where it is operating while the battalion will have a better understanding of the operational environment than any one team.
I agree with your point of view the problem into the research field is the rivalry between the same team members. The founds are few and so there is an huge completion. But if we remember as I do that we have choose this job as a mission to help the health of humanity the rivalry fade away leaving a real team working based on brain storming support between each others with great publications as result.
I wonder, to what extent is the collective intelligence also a function of the types of work they do and the communication frequency/ latency/ bandwidth between the team members