@pegasus_7 Real life ability/quality doesn't carry over into the game. But you cannot also simply switch two players and expect them to have the same impact, even if they have the same stats. There's also the factor of player form. Let's take your example. Let's say Fred has been getting goals and assists consistently and you replace him with a similar or even a slightly better player. Qualitywise, the replacement is indeed better. But they need not necessarily have the same impact on the team. That also doesn't mean that they won't have any impact, it's just not guaranteed.