Yeah he didn't interview anyone with the business acumen of davidcasemore. The people that he interviewed and consolidated what they had/thought that made them successful were minor players e.g.:

Thomas Edison
Alexander Graham Bell
George Eastman
Henry Ford
Elmer Gates
John D. Rockefeller, Sr.
Charles M. Schwab
F.W. Woolworth
William Wrigley Jr.
John Wanamaker
William Jennings Bryan
Joseph Stalin
Theodore Roosevelt
William H. Taft
Woodrow Wilson
Charles Allen Ward
Jennings Randolph

None of these people were even close to being on the same level as davidcasemore.