Dybala and Ronaldo are the other players who played in the center. And when they do, those wingers replace them in the wings.
It's true that Max doesn't trust young players, but a player who was barely good enough for relegated Verona wasn't good enough to start for us. You could see that in the few sub minutes he got, and he should've gotten more of those, that's it.
Coman now has nothing to do with Coman of then and Kean now. 19 yo Coman was unarguably on a diff level compared to 18 yo Kean.
After a brilliant start with Bayern, injuries and weak mentality (he actually said he's thinking about giving up due to injuries already) got in his way as they do with many young talents who don't fulfill their potential. Same can happen with Kean.