Setup, it is the way of putting the car in a position where it can theoretically go the fastest on a certain track. But that is where the theoretical part comes in, because to achieve that fastest lap time, not only is the setup important, but the driver needs to be able to take everything the setup is capable of delivering. That's why, even when the team has the fastest car on the track, different drivers will have different lap times due to their abilities to handle the fastest setup.
And even in the highest tier of motorsports, the fastest setup isn't what they usually go for. Instead, they try to find the sweet spot between the setup and where the driver has enough confidence in the car. But if the driver can handle the pointy, knife-edge setup that is fastest and can tame it, he will always be the fastest of the two.
The same was with Fatih, as those on the pit lane were watching him head out to the track after all of his setup changes were implemented.
