Yes, I agree. I might should have worded my sentence differently. I think I will edit it accordingly.
This raises the other problem for your scenario - the timing of the shots.
In your scenario (assuming a first shot at z133) the gap between the first shot and the headshot is 10 seconds.
There is only one witness (as far as I'm aware) that proposes such a time gap (Connally)
One witness.
Many describe a pattern where the second two shots are quite close together.
You are proposing - first shot then a gap of 5 seconds, second shot then another gap of 5 seconds to the headshot.
I can't find a single witness proposing such a thing.