If you read more about Lee Harvey Oswald you would see that he acted alone. The reason for all the conspiracy theories is that Oswald loved to play spy. He fantisized that he was an agent then a double agent etc.. Basically he wanted to think of himself as a player. The KGB came to this conclusion as well. After Oswald defected (with very little info to offer the Soviets) they concluded that Oswald was living in fantasyland. A nutcase. I've known folks like Oswald. One guy in particular who fantasized that he was in the CIA but also working in a maze of conspiracies as well. I could never really follow it all but basically he, like Oswald, wanted to play spy. The difference is that Oswald also assassinated a President. This was also part of his games. Also the fact that his wife was about to leave him and he wanted to impress her that he was a big man.
When does the next one come out?
Hopefully we won't have to wait another dozen years.