There are many things that are not lifelike
I set 5 players and one got hurt.
Training is a touchy thing and if you don't leave an opening with an extra player, there's less worry that your guy will be subbed out especially in a blowout.
As I've been told many times here you can't judge this as in real life.
This is Buzzerbeater life with rules all its own.
You must play this game according to the rules that govern it, not the ones from real life.