What kind of getaway car remains at the scene of the crime for 3 hours. Even an Amish getaway buggy could leave quicker than that.
You don't seem to understand.
Storing believes that the bad guys either planned to join the motorcade after they'd shot JFK "from the bushes," but changed their mind when they got to that intersection, or they planned on parking it next to the "island" for the TSBD shooters to drive away in after exiting through the BIG HUGE GATES that patsy Oswald had opened for them.