As I may only obtain several extra green packs for the whole season, it is too difficult for me to make 7 star player.
I do not power train players after they reached 6 star. So the quality of the best quality player I ever have at end of season is x2 or x7.
The players of my L25 teams are generally slow training even though the average age is 21.7. Just forget them.
The players of my L17 teams (average age 19.9) is not the best in these years on training, but almost all of them are still fast trainers before advancing to 6 star player. However, I just have about 70 green packs at present. I may not even make 1 7 star player with these stock.
1 green pack = 15% condition i.e. normal sketching for 5 times. To gain 1 sp, average progress of normal sketching should be at least 20%. I rarely have 5 star player achieving this in average in whole season. This is impossible for my 6 star players. So 1 green pack < 1 sp. 75 green packs are required to increase 1 star of a player. So I cannot even make 1 highest 5 star player to 7 star with about 70 green packs.