But, it shouldn't change fixed powers, should be something like;
Before sacking a player:
A:30, B:20, C:15, D:8,... Empty slot:3
After sacking player D:
A:30, B:20, C:15,... Empty slot:11
If it's true, releasing a player from squad is not a big deal and won't effect the team's behaviour unless you sign a new player to assign him free slots&roles, isn't it?