knap thanks for responding!
DCR is scoring many goal from corners, yes.
In regular play, DCL is playing much worse than DCR. If I chose the player who previous game played DCR on DCL position, he will perform on DCL position much worse.
Average rating for DCR is 7.26, DCL 6.65.
Now I chose both players as DC and in the last 5 games DCL is averaging 6.8 (quite constant grades) which is slightly better, but at least he doesn't get 6.0; 6.3, etc...
What do you think could be the reason for it?