The first driver has some reaction time needed so he’ll start breaking after the Tesla starts breaking. Which means, assuming they were at the same speed initially, that the 1st car will have to break a bit harder than the Tesla.

Then the second car will be in the same situation, it will have to break a bit harder than then first. 5 cars later, you are at the hardest possible breaking power, as it’s ultimately limited by adherence.

So, if there’s not a larger gap in the thread of cars somewhere to allow for breaking less hard than the car in front, it’s more or less inevitable.