Why does keep on winning makes my goalie rated like ****?

[nikolgiorgos]

Well, that's my little story about GKs.
At season 3 I got a GK from academy, 4*, 18T, fast trainer, who gave me the Champion's league Cup saving a penalty (p 5-4).
Season 4, I bought another one, 26 y.o., (with one-to-one sa) whom I used in Cup and CH.L. and my academy GK in league.
I had a rather easy league - you can see the standing, with very few goals against. Although my GK had rates of 5, max 6.
The other one who played in CH.L. and Cup, against more difficult opponents got 6-8 even if he had more goals against.
This season, my GK starting gets 5 and 6, it brake my nerves and I sold him after finding a young nordgen. Now I 'm using only him in all games (league-CH.L. - CUP) and has better rates even if in league I already have more goals against.
Actually I don't know if he is better than the other because I believe rates (as abilities) in GKs is a flaw on the game - an unfinished program.