I have 2 GKs. Both have very low ratings. The players very seldom get rating 7 and above. Mostly 6 and below. But this season, my main GK is averaging 4.5 rating. So far, my team is still undefeated and has let in total 2 goals in 6 matches. So I'm thinking the low rating is due to the GK not doing much work in matches. But 4-5 is quite low even for GK. Is my GK's rating normal? Or should I get them replaced? Any difference if I get an older GK? Thanks.