As told you, and to write my opinion publicly, nope, train hard is not a factor that affect the games.

Same all those who say -you bought a player so you need to wait a little bit to use him.- no. Fake. Absolutely, the game dont goes so deep, if there's a change in a individual player always will be inside it's limits, and with a change in the list of contribution of the team so changes come when you add-sell players.

Nai nanai of bench the goat cause after a while if you wait is gonna climb the mountain all alone.