Good relationship between the manager of a club and the owners helps the team to be together, a divided house can not flourish, when the manager is not in a good terms with the management the whole situation may affect the performance of the club entirely because the manager may not be concentrating in his coaching jobs and players also may not have the zeal to give their best in the football pitch in so doing politics may be introduced in a way that individual players may decide whom to support or take instructions from as the ugly situation is going on either the club owner or the coach and this may lead to underperformance of the football club.
No matter how good you are as a manager in as much as you were hired by a person or group of persons, you are answerable to them because there are conditions and reasons that made them to hire you as such you don't act on your own, although many managers has used their coaching strategy to bring success to a club and thats the purpose for their employment but before you make any step as a manager, you must involve the owners of the club before anything although sometimes club owners are very annoying in terms of decision making.
As for morinho we know that he is not a bad manager but he is arrogant although am not judging him because different people has their personal character but I believe that what happened may be as a result of his attitude and nothing else.