Not actually against your theory but at least give us a motive for each person in the car to make it more interesting.....
Jackie would have wanted him dead for publically humiliating him with his tarts....
the others...paid off perhaps?
Then there's the mafia, the CIA and everyone else that wanted him dead....so not much of a conspiracy.
But if it was done openly in public like this, my point is, surely it would have been a spur of the moment murder...because otherwise it is the most ridiculous assassination idea ever.....in an open top car, get the passenger to kill him and the rest of us say it was a shooter in the hills.....but what about the crowds that will see it?
So yes, I get what you are saying, you think it was someone in the car...I get that. But why? What motive? And was it spur of the moment or deliberately planned?
Even if you don't know - just give me your theory, that's all I was asking...