Oswald did it .....alone.
I’ve read it all or almost all...Conspiracy theories raise more questions than they answer and raise more questions than “Oswald did it alone” does. Much, much....much more likely that Oswald did it alone.
There will always be a certain amount of “reasonable”, or “not so reasonable”, doubt.
I don’t know enough to say one way or the other.
I recently listened to one conspiracy theorist who had the entire leadership of the American government, at the time, involved in Kennedy’s death. The conspiracy theories are more incredible than the theory Oswald acted alone.
My theory: It was a classic double hit (Mafia Style). Officer Tripit was to shoot Oswald but Oswald thought something was bad and shot him first. Jack Ruby was a last minute replacement to shoot Oswald—who knew too much. They knew Ruby was Terminal—and I bet his family were rewarded well for his act. More than one Shooter—Osward was the patsy—he even said as much before he was silenced forever—Dead men tell no tales.
With all the lone gunmen who have shot people since 1963, I wonder why so many people find it difficult to accept that a lone gunman took Kennedy out? I suppose it's because it would not be a "Who Done It?"
If you have read it all then you can explain where the bullet hole in the windshield came from