trust is so fragile and so laboriously created that it may never extend very far in a top-level team. "Building a really high-performing executive team at the highest level is a mirage," says a management consultant who doesn't want to be quoted because this particular message is a downer. "When such teams do exist, they'll consist mostly of two people, maybe three."
It's just too hard to build trust more extensively at the top level, where everyone is supposedly a star.