If some idiot wrote a script like this...it’d be a black comedy of sorts. You couldn’t have invented a character like Oswald...who gave up his citizenship to escape to the Soviet Union...then he comes back...and the FBI doesn’t ask any questions...just letting him walk right back into the US and begins this wonderful relationship with some “Free-Cuba” group. Then you write the script where Oswald buys the cheapest gun possible, via some mail-order company...which he then uses with absolute precision. And his moving to Dallas...so perfectly timed...with no obvious reasons...with his Russian wife.
I’ve always speculated that about 30 seconds after Kennedy was shot...that Oswald sat there in the building...suddenly grasping how he was “framed”, realizing how the whole thing was a set-up and he was supposed to “fall the right way”. There were probably a cop or two who knew the plan...and were supposed to shoot him in the building as he escaped by plan “A”...but he grasps this...and suddenly goes onto some plan “B”.
By evening hours....Jack Ruby gets his call that he has to clean up this mess by any method possible. So you have to imagine Jack’s hours over that evening...thinking about what he had to do...and how his life was finished. Oswald had seconds to grasp his role in this mess...but Ruby had hours to wonder about his future before he carried out the mission.
Johnson, knowing the basic plan from the start...probably sat there for hours after Oswald was taken to the local police station...and hoping that something could happen before anything was said. I doubt he got any sleep that night...hoping that Ruby would just do the job necessary.
In the end...they all relied on a incompetent media, with various political figures carrying out a public “clean-up” campaign, and getting the media to just believe things.
In today’s environment...with digital cameras and internet...none of this would have been possible. A spilling of the entire story would have happened within 48 hours...and the VP would be forced to resign within a month...with a national crisis developing over who quietly replaces the president and was he a part of the conspiracy?
In order for that theory to be workable, Oswald would have had to NOT know who “set him up,” or have been led to believe it was an other entity than the true one.
However, what would be his motive and reward for being used? Also, wouldn’t it occur to an even below-average intelligence... which he was above ... that one’s own life would be in danger following such a “mission?” Why would he willingly give up his life?
Your theory has too many people “in the know,” which lessens the chance of effective cover-up.
I think there is more to the assassination than what we have been told, but the problem with conspiracy theories is that it gives more power to one person (in this case, LBJ) than is realistic or feasible. Why would others comply in giving him additional power? What was in it for them?