Still
@Hansi Fick has a point, most clubs make far more mistakes than Bayern do. You mentioned Salihamidzic and Kovac but i would argue that Salihamidzic' signings so far are actually ok (not great, but most players he signed are at least useful squad options). And Kovac did a great job in Frankfurt, it wasn't like he got the job just because he was a former player, but because he improved that team a lot and was able to go head to head against Bayern, at least in single games. Sure that went wrong quickly, but they identified the issue, replaced him well and won everything.
Which club in the league is run on a similar level of good decisions? In the long run I'd argue only Freiburg.