But surely he's gonna be used like Barza, or, due to his injuries, Chiello (I say that because I don't believe the myth that our coaches just pick the player they besties with). He's not gonna remain a certain starter, we'd transition over from one to another.
I don't get what Demiral could possibly be angry about at this point. If he expected to be a certain starter for Juve just like that, he was a bit naive.
He's young and if he's good enough he'll get his starting spot in the near future.
And again, It's not like he isn't getting any playing time when fit. Imo it would be stupid if he wants to leave.