That's why I'd go for Tuchel mate, not for his time at Dortmund, but rather for what he did at Mainz - picking up a team - the team Klopp took up and then down again, he kept safely in the division and qualified for europe as well, at Dortmund - yeah ended badly cos of problems with the higher ups, but his record there was very good - considering the league was arguably stronger than when Klopp was doing his best at Dortmund - with a very dominant Bayern and stronger top half.
Young, fluent in English as well which helps, a point to prove, and has worked at three separate clubs in Ausburg, Stuttgart and Mainz as a youth coach prior to stepping up to the main job at Mainz - and both Stuttgart and Mainz produced some good young players during his time there.