Researchers have found that for a team to be effective, what really mattered was less about who is on the team, and more about how the team worked together. In the order of importance:

Of the five key dynamics of effective teams that the researchers identified, psychological safety was by far the most important. The researchers found that individuals on teams with higher psychological safety are less likely to leave the company, they’re more likely to harness the power of diverse ideas from their teammates, they bring in more revenue, and they’re rated as effective twice as often by executives.

The two most important things, psychological safety and dependability, both increase trust in the team.

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References

Guide: Understand team effectiveness - re:Work at Google