I was going to say something similar. Isn't the Gk... are what I call the contributive players.
Key player- appear 90% matches doing something good
contributive - can do "something good" 1 match yes, 1 no so ratings look like 6-8-6-8-6 . These can have a positive impact or a bad one, ex. assisting time to time, or been aggressive, losing balls etc.
neutral - dont appear in the old simulation with comments -so we don't see their name- but he can have a impact in the players arround, for good or bad.
The GK can't be neutral, because if Im right, we see him in the 100% of matches, but can perform in a random way, or be a key player, been determinant in some way (ex. I had my Gk in FKs scoring a good amount of them, and stopping PKs often)....
So.... all isn't black or white, ofc. a scorer have more attention than a DC, but it's interesting see the differances between x and y player and realize that at some point, any position can be determinant.