It is absurd to imagine that the passenger in the first row window seat gives a flying fuck about the disembarking time of the last passenger, and then build a model on that absurdity and present it as a serious suggestion.
I think in practice, if 1F could sneak out without blocking the aisle, it doesn't matter. The true important thing is that the aisle not be blocked. The aisle space is the limited resource. There are even more "lassiez-faire" versions of this simulation that could somehow try to model "unregimented" standing. Might be worth doing.