On a serious note: He got Paderborn from third league to the first Bundesliga. And while they instantly got relegated again one has to see that they invested almost nothing in the team but in the infrastructure, so they competed with a mix of 2nd/3rd league players.
Now he had a strong beginning to the season in Cologne, went head-to-head against CL teams (got an unlucky loss in Munich and a draw against Leipzig) and is currently 6th in the league with a squad that got almost relegated last year and lost their best defender (Bornauw to Wolfsburg).
Still early, but he might actually prove himself there to coach a top team in a few years. His "I want to win every game" mentality, his usage of the whole squad and the shown tactical flexibility (for example against Leipzig his 442 did not work, changed it to a 4231 after 30 minutes) at least gives me hope.
But most importantly he is the only one who ever played for my home club Spvg Aurich (somewhere lost in the 4th to 6th level in Germany)