Klopp built Mainz up from virtual pennilessness (he had a smaller management team than Shankly had) to the top division and earned them enough money to build a stand. Not to mention he got the Mainz job because they wanted to save money and he was already an assistant whilst still playing. That got him a go at Dortmund, who were also nearly bankrupt when he took over. Klopp is a bad example if one wants to point at a white manager who got opportunities he didn't deserve.