https://www.foxsports.com/college-football/story/peyton-manning-ryan-leaf-june-jones-the-qb-book-excerpt-feldman-102814
Jones could rattle off the names of all the great quarterbacks who were ESTPs (FEIRs): Joe Montana, John Elway, Johnny Unitas, Joe Namath, Jim Kelly, Troy Aikman, Terry Bradshaw, Fran Tarkenton and Brett Favre. An eye-catching majority of the Hall of Fame quarterbacks who played in the past 30 years are this one personality type. So were other Super Bowl–winning quarterbacks Ken Stabler, Phil Simms, Joe Theismann and Trent Dilfer. Jones used the famous NFL Films anecdote of Montana — the moment before beginning a last-minute, game-winning, touchdown drive in the Super Bowl, walking into the huddle and matter-of-factly pointing out John Candy in the crowd to one of his linemen as an example of a guy wired to thrive under pressure.
"ESTPs, under pressure, play their best," said Jones.