I am not asking for perfect training every week. I am only asking for a plan B but it seems I am not allowed to have it anymore. I believe the BB developers have changed the substitution logic.
So from a GS perspective, are you saying playing 48min is better than 70min? Will your game GS goes down or up playing 48min vs 70min? If I remember correctly, I have played my guys in the 70ish range and didn't see much negative impact on GS. I don't know about 48min since I rarely have guys at around 48min (either way below 48 or >60).