his loud mouth running to every microphone bringing unrests to the team isn't a viable option to sit him on the bench. Remember when he was second to Bravo and ran to the journalists to pressure the club every day to make him number 1, which even peaked in him threatening to go to City?
Someone really think he would have accepted his bench role calmly over the season? Just the recent example of him getting fit a few days before the CL semis and publicly demanded Tek to be deregistered and him registered for the match against Milan showed it is no option to keep his loud ass on the bench.
Bringing unrest to the team

He ran his mouth in some interviews which club setup before his comeback. Doubt it he went to the club and asked for video interviews so he can run his mouth.
Again with that Bravo story, seems like some people don't care about checking the facts. Ter Stegen was signed before Valdes left. The view was for him to succeed Valdes as no 1, but in 1 year or something like that. Valdes left, Ter Stegen came in and got injured in pre-season. Club then signed Bravo who then started in LL for 2 seasons. It was dumb from LE and the club to think two GKs of same caliber will just go along with this setup, even more so when Ter Stegen was signed as No 1. Of course he pressured the club when he had offers as starter for other clubs, that's the way things work. Club then made of decision to sell Bravo to City instead of Stegen.
Courtois started a CL final after a big injury and no one said anything. Even though Lunin was in the form of his life and the guy that did the heavy lifting for Real to get to that final. Again double standards when talking about a similar situation. And there is really no evidence that Stegen's agent talked to the club or anything. Which, if he were my agent, I would surely expect him to do.