The departure of Xabi Alonso was indeed a regret to the club and hiring Erik Ten Hang as the head coach was the mistake then firing him was actually the exact way to correct it and now hiring Kasper Hjulmand is the wise decision to take, I strong believe he will bring back the team to it winning ways, I'm not really expecting a performance like that of Xabi Alonso but hopefully he won't disappoint, he's kind of play tactics and formation will definitely set back Bayern Leverkusen to their normal state, rather than that of Erik Ten Hang, like I really believe he can handle the job well.
Xabi's departure is ine in which event Leverkusen had little to almost no power on it because at the time, they could only make him an offer but could not stop him and Madrid made him an offer that he found okay and went ahead to move from Leverkusen so at that time the mistake is on Leverkusen to have looked for a coach and sacking him within the shortest period that can be taught of. If they needed a better quality coach, they would have rather be patient and get one than that which they just dif with ETH.