I love leadership studies as my MBA specialization is in Leadership. However, while there are many good examples and prime thoughts on leadership in the Bible, the Bible is not merely a book on leadership. When studying leadership, I found that leadership styles throughout the Bible varied and there did not seem to be a cogent overriding theory for how to be a successful leader from the text of the Bible. As well, being a great leader was secondary to obedience. I think having a study Bible on leadership is foolish. The Bible is not designed to give you all the great leadership ideas, but to thoroughly equip you spiritually for every good work.
God came to give us life and give it to us abundantly, He did not come to give us modern leadership theories.