While one person per team is ideal, two are better because they can discuss ideas and improve through arguments. If their views become too extreme, having a thi

While one person per team is ideal, two are better because they can discuss ideas and improve through arguments. If their views become too extreme, having a third person is better to moderate the views. Fourth person is needed so that one person wouldn't be a pariah holding minority view, and you want a fifth guy to make sure in 50/50 split, a decision gets made. Five people need a lead that keeps track of everything, maintains the goal and resolves conflicts. Of course, two leads are always better than one because they can discuss ideas..