I think the model is some generalization that no one should base anything on.
I agree
Three points:
1. The model shows that Jerry's pejorative rejection ("bats__t crazy") of my "theory" that the first shot occurred between z190 and z200 when the car was between the lamp post and the Thornton Freeway sign ie. here:

is, in fact, rejection of a serious working hypothesis of the FBI and WC - at least in January 1964.
2. The model shows that it is quite reasonable that a shot at that time from the SN through JFK's neck exiting on a right-to-left downward trajectory would go to the left side of JBC's jump seat. With JBC turned to the right was he was from z190-200, the bullet could easily have missed the right side of his torso and implanted itself butt-first in the thigh.

3. It shows that Arlen Specter's demonstration of the trajectory:

is not consistent at all with the actual trajectory from the SN through JFK at any time while the car was passing along Elm St. before JFK shows signs of having been hit in the neck.