FORT MYERS, FLA. – Kip Elliott, the Twins chief financial officer, called Dave St. Peter a “unicorn.” St. Peter, who grew up a Twins fan in North Dakota, offered a more Midwestern metaphor.

Many are familiar with the story of perpetual youngster Peter Pan, the boy adventurer created by J.M. Barrie in the early 20th century. He’s been the subject of numerous plays, musical ...