I'm sure it will settle down over time. It feels like every season the contribution rate of single players is different. Last season my AMR was very good and AML bad, this season it is the other way around in terms of match ratings. And in the first few games of the season my new striker was very promising. Had like 7 goals and 5 assists in 5 games or so, which is phenomenal for striker. Now he is not really on fire. As long as I win the games I need to it is fine though. My DC can score 5 goals and I wouldn't care.