That's not really true. The game shape resets at the end of each season, but the extra experience gained from playing in 30-40% more games stays forever ;). If you sell a guy like that early in the season you are actually maximizing the profit by making him more attractive, and if kept he will preform better in the long run. The reason the OP should fix his GS to me has more to do with the fact that he should be trying to promote, or else be prepared to have to sell his guy early next season after his salary is likely to increase, potentiality by a lot.