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.