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Well, I get your point here, and it's natural to assume that certain veteran players believe they are superior than their coach. Then, a fight over superiority between players and coach will occur. It causes players to grow disrespectful toward their coaches, which is what happened to Tuchel.
I am sure kompany will suffer the same difficulties as Tuchel.
about what will happen if the club has a horrible start, and it is extremely clear. The fans will boo him, and officials will consider firing him in the middle of the season.
Not necessarily the same problems, but worse than Tuchel. Keep in mind that Tuchel won titles. Three titles with Chelsea, including the Champions League. He was the FIFA world coach 2021. He won the DFB Pokal with Dortmund in 2017. The point is that it is harder for players to attack a coach who has already won something. It will more be like Nico Kovac who has not won much and then became the Bayern Munich coach. I think literally everyone knew that it would not work out. He still won the Bundesliga title with Bayern, but that had nothing to do with him. For Kompany everything will be fine for as long as they keep winning nonstop, but if they don't, my bet is that he will be gone rather sooner than later.
The only problem then is that there are no top coaches available and Bayern would be forced to run another experiment with some unknown guy.