In JFK literature we keep hearing about a triangulation of fire where three shooters would fire on a target such as JFK in this case. But why would someone set up an assassination plot involving three shooters which would triple the chances of one of the shooters getting caught? Wouldn't it make more sense for an assassination to be planned where you have just one single skilled sniper using an automatic rapid fire weapon?
And if you're talking about trying to frame that one sniper (as is often proposed in the case of Oswald), that can be done in a plot where you have just one sniper too. You do not need to have three snipers to do that.