I spent several days at Dealy plaza and it is obvious after watching the traffic that a single shooter would take the shot Before the slow left turn towards the triple underpass.
Vehicles at That left turn are targets like fish in a barrel, Oswald could have taken out everyone in that convertible!
It is a much easier shot than the sweeper to the left going away from you.
My husband a shooter himself said the same thing. A shot with the car coming toward you would have been an easier shot than the one Oswald took.