Forgot to say another interest test/method I do.
I use only one GK in whole season.
Tafarel, seasons 5-6-7
Attachment 43438
Dida seasons 8-9-10 and this one 11
Attachment 43442
after those weird rates of GKs, I decided not to bother much.
So, I buy a GK, young, good trainer, give him one-to-one and test him.
If he gets avg near 7 (some 5s, some 8s) it's ok. Then I just use him in every game.
With the participation in every game and little training, he is finishing the season as a 6*.
Next season, as 5* player. The same most of my players do.
If he got injured, I heal him asap and use him again. This usually happening once in a season.