Thanks, Priscella. That's just a teaser really. I spent years of spare time looking up details. I've thought about writing a book, but who cares anymore. It's just another theory by another conspirist.
The most compelling support of a conspiracy is the supporters of the 'Lone Gunman' theory having bent so many facts out of shape. They tell you Connally's jump seat was low and inboard aligning a single bullet to go through Kennedy and then through Connally, but all the photos of Connally sitting in the presidential limo have him up against the door. The path isn't possible.
There has been marathon training to duplicate Oswald's alleged steps. Three shots so close together from a mediocre rifle with a bad scope...sure, a marksman has done it, or nearly, after practice. By shooting at a melon on a track he had the advantage of absolute certainty of where the target would be and when to fire. There was also an effort to increase the time between the shots, claiming the recording was originally run too fast. But even slowed down, Oswald's heightened anxiety should have scattered his shots and disturbed his coordination. It's unlikely he could have fired accurately and quickly. But this is conjecture.
After that adrenaline, he races down six flights of stairs to casually sit before the arriving officer could have witnessed him darting though doorways...composed and not at all winded. Yeah, it was done by an athlete, after several attempts. They also had prior knowledge of the course, no obstructions or fear of survival. That shows it was possible, but not that it was possible by Oswald.
Can you imagine Oswald practicing running down the steps during work? "Hey, Oswald, what'cha doin'?" "um...Nuthin'".
Leaving his weapon behind was an absolute confession. Oswald, a proclaimed marksman only had access to that one gun? All the planning. All the timing. All the set up over how many months and he was then dumb enough to use the miserable example of a weapon that traced back to him? Not really a mistake a calculating person would make. Oswald was misguided, but he wasn't stupid.
Lets not forget that with Oswald dead it basically ended any serious investigation. With no one to prosecute there was no reason to try. The risk of a conspiracy being exposed was effectively eliminated. Any investigation beyond that point was steered toward the conspiracy, but by then the alleged conspirators controlled all the evidence.
There are two ways to look at Oswald. He contrived a plan to kill the president and executed it, escaping in the chaos and shooting Tippit for fear of being caught.
I am puzzled over the report that the motorcade route was changed, and how Oswald could have gotten that information. The TSBD sixth floor window was a poor choice for the original motorcade route. Some report it was changed days before. Some say it was altered that same morning. Either way, Oswald would have had to move awfully fast to take advantage of the change. Was it just a happenstance? Was his assassination plan that spontaneous? Or was it contrived to put the assassination in Oswald's vicinity?
The kill-shot was about 250 feet at a target moving inline with the aim. Most say that was a pretty tough shot. The original route would have been about 350 feet at a target moving on the perpendicular. That would be an amazing shot. Comparison: A gunman in a football stadium targeting the hotdog vender pushing his cart beyond the opposite goal post. Oswald was a trained sharpshooter but not a sniper. He was more of a point and click gunman.
Admittedly, a kill-shot from the viaduct is just as remarkable. But it might have been a trained sniper.
The Zapruder film shows people lining Main Street, away from Dealey Plaza and many walking across the grass to witness the new route. Main Street was packed before turning onto Elm Street. There were comparatively few people on Elm. Few knew of the change. The route change was apparently available to some, but was it available in time to hatch an assassination plan?
Or was it a conspiracy to frame Oswald, who had reportedly been harassed for a length of time prior to the assignation, and him being a paranoid personality expected trouble based on the manner that he had been harassed. Tippit could simply have been a victim of Oswald's paranoia. The speed at which Oswald was located in the theater, and the amount of information that was available after his arrest suggests that much of what Oswald did was already documented and readily available. It might be that he had just cause to be paranoid.
There remains a possibility that Oswald could have been the suspect even before the shooting.