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I want to believe you understand that kompany isn't a top class coach globally a d this is his first time ever having to manage a team as this as he has been managing below average teams before now and winning trophies is one thing he hasn't frequent in his coaching career so for him it's a whole lot trying to build that mentality in him first and then achieving and bringing it to reality already, those are some factors we need to consider checking kompany out and considering his achievement alongside his skills so far.
Of course I understand that he is not a top class coach and have only managed average teams but that doesn’t mean he doesn’t have the talent and potential to be a world class coach. If he hadn’t shown some potential Bayern Munich wouldn’t have considered giving him the job, he is still young at the coaching job but winning trophies for Bayern Munich would not be much of a problem and even if he doesn’t win the champions league now he should be able to manage to win domestic trophies for now. Bundesliga is not a too challenging league that’s why I don’t think it will be difficult for him to win trophies here and if given time he will develop into a top class manager.