Like the HSCA, I am convinced the JFK assassination was a conspiracy and it's just a matter of figuring out how they did it. We must start with the assumption that this was a coup d'etat and go from there. Every good coup d'etat needs a patsy and Oswald was it. He had no prints on the murder weapons, his scope wasn't sighted-in, he was found at the wrong place to be the assassin, he got a job 3 weeks before the motorcade route handed JFK to him on a silver platter, there isn't a viable trajectory for the MB to have done what it did then magically show up unscathed on the wrong gurney, and on and freakin on.
The DPD were obviously sheep-dipping Oswald and their handling of the evidence was proof that they were involved in the cover up. You have to ignore such a mountain of circumstantial evidence to be a LNer that they are more WC defenders than LN theorists. They are Conspiracy Deniers foremost because a whole lot of denial is required to stick with the fringe LN hypothesis.
As far as speculating who the actual conspirators/assassins were, the skeptics paint E. Howard Hunt's confession along with James Files claims. They think that dirty rats can't be trusted to tell the truth period. But what was in it for Hunt to confess? It wasn't a badge of honor assassinating the beloved JFK. It could only bring shame to his family to sell out for a book deal. Files didn't even have that option. He was pretty much ignored and written off as nuttier than Oswald himself. But he gave 3 details that made me sit up and take notice:
1) He claimed that he used a Remington Fireball that shot .222 caliber frangible bullets. The Fireball was the best weapon of its kind back in 63 and perfect for the job. And if JFK's head was not struck by a frangible bullet then I'll eat a bug!
Files' shot from the knoll caused a right temple blowout and you can see the fireball in JFK's head at Z frame 317. That is NOT sunlight reflecting off of brain matter. Deny this at your peril.
2) He claimed that the turkey shoot was intended to make near simultaneous shots sound like 1 and that his shot happened a split second after another shot had struck JFK in the head from the front (back then to the left), which is what the Z film shows.
3) He claimed to have bit a dent into the shell casing and dropped it at the site so he could claim bragging rights when someone found it. There was a spent .222 casing found at the site in 1987 by John Rademacher and it matched his description exactly. Analysis of the hull estimated it had likely been in the ground for 24 years as claimed. Skeptics scoff this off as an obvious hoax, but that's because they are conspiracy denialists 1st and critical thinkers 2nd.
Given the original assumption that this was a conspiracy and Oswald was not a LN, IMO James Files is an excellent candidate to be one of the shooters, of which there were several.