Applying Occam’s Razor to the entire scenario, it is clear that Oswald was the lone assassin and also planned it alone.
A giant, multi-level conspiracy would not have worked.
Someone, somewhere wouldn’t have gotten the word and/or would not have accomplished their assigned task properly.
The only plausible way to do what was done - how it was done - was for a loner to do it.
All one has to do is apply logic.
Oswald was the lone killer!
Don’t believe your lying eyes when watching the Zapruder film
If the Zapruder film never surfaced this would not be a topic of discussion.
It clearly shows his head going back and to the left... back and to the left... back and to the left
And dont forget the 4th shot that hit the curb
Personally, I think things get successfully covered up all the time. In this case, successful doesn’t mean that no one questions it—it means that the vast majority accept it without comment or dissent.
Or maybe you believe the “official” story about TWA Flight 800?