I'm sure other fans can offer more insight because I don't get to watch all the games, but Schwartz has been pretty ineffective in the games I've watched. He's not driving the play with his possession like he used to, he's not really creating plays in the offensive zone very often. It's really hard to figure out. Both him and Schenn have looked pretty ordinary this year and that absolutely has to change if the Blues are going anywhere this year.
The reason why? We can only speculate, but we know the talent is there. So could it be off the ice issues with the coaching staff? Players don't seem to be "buying in" right now, so not sure if there is a disconnect between the players and coaches. Other than that, I can't really guess the reason for Jaden's slow start. Plenty have Blues have looked "off" this year, so it could be more of a team issue than individual one.