Justdome mentions a bit in the guide about scout+ players and training, sslllooowwww! as they have reached pretty much the top of their game.
I'm hoping the 18yo 6* improves next season as his quality levels out in a higher level.

Another of my 22yo 7* got MOM tonight only one SP like but his progress tripled from the previous game where he was awarded a 7 against tonight's 9.