Not necessarily.
James on Arsecast this week made the point that Pep went after Aguero, benching him and favoring the inferior Jesus. That was possibly a way to show that no man is greater than the team, even though he was sacrificing potentially the best player in the league to make a point.
Ozil needs to make himself indispensable. He has not shown himself to be so since his first season here. If he does not shape up, I don't see why we shouldn't transfer list him. 15m pounds a year is a lot of money.