The debate about public versus private ownership of companies implies a binary choice with one winner. David Craig’s experience of transforming the former data and analytics business of Thomson Reuters, which he recounts in “Bluebook: How Bold Leadership Unlocked A $27 Billion Success Story,” paints a more nuanced picture. The Finance and Risk (F&R) business, as it was known, was a loosely integrated product of the 2008 merger of Thomson and Reuters when Craig was put in charge four years later.