Just a few years ago, titans at the height of their power were at the helm of the biggest players in the European auto industry. Martin Winterkorn at Volkswagen Group, Sergio Marchionne of Fiat Chrysler Automobiles, Rupert Stadler of Audi, Dieter Zetsche of Daimler and Carlos Ghosn of Renault all became CEOs in the mid-2000s. All of them navigated their companies through a brutal recession to robust profits and sales.