Of course, Bayern Munich will never choose Kompany if they have no strong reason. It can be about the style of Kompany in managing a team, or it is about the personality of Kompany. But it is very doubtful if Bayern management chooses him because of his achievement as a manager. There are too many other coaches/managers who have a better achievement than Kompany.
Regarding the characteristic of strong leadership, I think each manager/coach has that characteristic. There is nothing special about it, it is just a common matter. However, if a coach has a charismatic impression, it can be something special. Not every coach/manager has it, it is only owned by few coaches such as Zidane, Pep Guardiola, Sir Alex Ferguson, and Ancelotti. It is too early if we assume Kompany has the nature like those coaches.
Yes you are right Bayern Munich must have a good reason to think about making Vincent Kompany their manager. Just because he was great player doesn't mean he will be great manager. Many managers have good leadership skills but some special ones have unique way of inspiring their teams. I think it is too early to say if Kompany has what it takes to be like some of the best managers. I think Bayern Munich is probably looking at how he coaches and leads not just his achievements as a player.
I don't think the idea of making Vincent Kompany a coach of an A list club like Bayern Munich was a bad one, but however i know he has managed other teams before now, but I don't see the level of success from those previous teams to add up to his resume for him to have landed this Bayern job, well maybe i will just agree that favour found him.
I agree with you that it will be too early for us to expect too much already from kompany, but the unfortunate thing is that managing a top-notch club of that caliber requires almost an instant results, more like it's not a place for you to come and start testing the microphone. When he has a coach for those previous clubs, most people cared less about what he was doing, but trust me the Bayern job comes with a lot of responsibility and less excuses. So does Vincent Kompany have capacity to handle those responsibilities, is what we are going to see next season.