By the way, is it just me or is BB's GS system getting more and more random? I've got a U21 player who plays 48 minutes every week, and suddenly one day he plunged from 9 GS to 7 GS with the same number of minutes and same training.
I trained GS this week and 9 of my 13 players are at GS 9. The rest are at 8. Worked for me.