I believe it is excellent social skills. I was going to say self-reliance, but ultimately, no one can do everything all by themselves. Someone with excellent social skills can find ways to gather people around them; with each one using their best skills, a lot can be accomplished.
I recently saw the movie "Selma", about Martin Luther King's march there. Though he was brilliant - obtaining a PhD at age 21, when most people are lucky to get a college degree - he could not orchestrate that march all by himself. He needed as much input as possible, to figure out how to deal with the forces involved. That is why he was successful there.