Micah Richards summed it up pretty well on Friday. Whilst he doesn't agree with it himself, Tuchel wants players who are not upset with being on the bench. The "big stars" may not accept that and cause the team dynamic to fall apart. He wants a squad of players who work well as a team and it isn't going to be a massive thing either in camp or out of it if they are benched.
Wants a squad on team players, not solo ego's and big stars. Could work well, could bite us all in arse.