Leadership is Context Specific
Leadership is context specific. There is no such thing as "universal leadership" or "global leadership". Experience of leaders in different fields has proven this.
Leadership is about clarity of purpose in a given context (business, organization building) and achieving the goal, fully involving the team in the process.
Study of different leaders and leadership styles will help in gaining insight as to how goals have been achieved and what style has helped, but individuals can innovate styles and still succeed.