Some players choose to delibertately weaken their teams because it will probably give them an easier cup draw for the following season as the cup is based purely on skill quality so you could potentially play teams several levels above you. they will weaken their teams then on day one buy as many scout players as they can afford to chase a cup advantage.

I personally dont really care for the cup. i prefer to play the long game and keep my team as strong as possible. i try to replace around 7 players every season with the best quality players i can afford ( usually scouts).

Use the early seasons to find your own method of how you want to play and if you want to go cup chasing...