I think senior club managers can also make mistakes. I am curious about Thomas Tuchel's performance like everyone else. Despite Nagelsmann's not bad statistics, his brutal dismissal from the club even took place in the world press. Many sports commentators said they found it pointless. I hope Tuchel draws a good graph from Nagelsmann.
We are a few days away until the match between bayern vs dortmund. You will be able to judge the performance of bayern once you will have seen the result soon. I can't even wait whether tuchel will get a success with his debut or not. I guess that if team's management will be blamed by all of bavarians if tuchel was unable to win against dortmund. It's pretty much the same like waiting for the day to judge tuchel. 
Naglesmann didn't have bad statistic at all. He is still having 100% win with bayern in UCL this season while bayern's performance in bundesliga is not so bad as it's still sitting at the second position but it seems like that management aims for the perfect result from coach.
That's why bayern was making a very harsh decision to sack naglesmann. Naglesmann known if he has been sacked from the news. Im very very interesting with upcoming match