How many employees left with 3 minutes of the assassination?
That doesn't prove that he fired the shots. He could have been fleeing because he realised that things were looking bad for him because of how much he was involved in... something.
How many employees owned the rifle on the 6th floor which was directly linked to the bullet fragments found in the Limo?
Again, this doesn't prove that he fired it that day.
How many employees got on and off a slow moving bus, caught a cab and got out way past where the lived?
How many employees went to their residence and got a revolver?
Again, this could have been his panic, his fear that things were looking bad or weird, in relation to what he'd been involved in.
How many employees killed a cop?
Much debated here.
How many employees snuck into a theatre, resisted arrest and tried to kill more cops?
Again, could relate to his fear of the situation.
How many employees were arrested and told one provable lie after another?
Ditto.