I'm sure you can check and you'll see that probably less than 5% trains 3 players. You may drop drastically the efficency of the 3 players over 36 minutes in an exponential way. In this way you may let free to train and force top teams to have at least 3 decent backups
1990-2022 Stalinorgel - https://www.youtube.com/watch?v=pV-Xppl6h8Et