GS is reset to 7 exceptionally, after the season change on tuesday, and reset to 7 again on friday morning usual update.
Also DMI is wrong (doesn't correlate to GS) until updated on Friday.
You can focus on training, but be careful about injuries. Injuries are healed when the season change, but you can have injuries for the first scrimmage of the season, So beside your trainees, there's no point in fielding your others strong players.