Dortmund doesn't have outright owners, sorry to be pedantic
Most German clubs don't, they are majority owned by the members. But I know you mean the bosses as in Aki Watke and Michael Zorc.
As I say, they don't come out of it well either, but from problems with the head scout, to disagreements with transfers, including Tuchel not being happy with them going for youth over experience, from man managment issues and problems with players, and a complete breakdown in trust between the coach and the team bosses. There where many problems. The whole thing was pretty unsavoury to be honest!
I agree that you don't want a walkover by the way, but having a coach who can bring people together is actually a massive plus. And sometimes in these situations, it's more than just a clash of egos. The whole thing at Dortmund was a slow simmering pot, that took a long time to boil over. I sort of wonder if they'd sorted stuff out earlier maybe there was a chance, but it was clear long before he was sacked that it wasn't going to end well.