from my experience even two people who can work together well and form a duo is a rarity
and even then it's usually the multi-talented ones ( graphics and game design + programmer duo seems to be most commonly successful)
as a rule of thumb the bigger the team the bigger the chaos - there needs to be at least one persistent and headstrong fellow to hold things together (who is not necessarily the leader)
in the end I find that some projects beyond a point simply 'complete themselves' and most of the work is spent on 'finding the end of the tape' and the real benefit of a team comes when you finally see clearly what the finished project should look like and there is a lot of grunt work needed to get there 🤔