What is wrong

[iSusel]

I strongly recommend to sell the subs that performed as key players in the past, to liberate the role.

This is interesting... In my 1st season I had a not high rated (~80-85%) 26 y.o. AML that scored ridiculously many goals and stole the Top Scorer from my own main 20 y.o. attacker AMC/ST. Then he got +30% Finishing and continued doing this on the 2nd season, so inspite being quite sentimental about that, I had to replace him. Now he's sitting on the bench but might keep his attacking role with him, so it seem I'll have either to sell or to use him.
Update: Tried putting all attackers (AML AMC AMC AMR ST) in one friendly game against 3* team, the AML had 10 rating with 2 goals and 1 assist after the 1st half already... :-\