I think there were two shooters, but Oswald fired all the shots heard on the day. I also belive it was a conspiracy.
I subscribe to the Red Dwarf theory, that JFK from the future shot JFK
After a lot of resarch, which I'd rather not detail atm. Maybe later.
I think it was two snipers, because of the way his head splattered. It blew out from the right side, and if it was Oswald it would have been ether front, back or left side.
looks to me to be the rightmost top of his head