Julian Nagelsmann: when he took over in February 2016, he was exactly 28 years, six months and 15 days old, making him the youngest permanent head coach in Bundesliga history as of December 2019. Bernd Stöber had been younger in 1976, but only as a one-match interim at Saarbrücken. Nagelsmann was no stopgap. He was the appointed saviour.