The  qualities you describe as great leadership could be seen to directly parallel the qualities of a great coach or teacher as described in The Talent Code; soft spoken, a great communicator, with an intimate knowledge of the steps to be performed, establishing trust by the constancy of their message, which starts with their love for the thing taught and the character of the teacher.

A leader has the additional role of understanding any great endeavor is the leveraged efforts of a team, each member bringing their own skill set and understanding of the direction of the organization.

James

"The leading of the many is like the leading of the few, it is a matter of planning the divisions." Sun Tzu