I do think that Oswald's emotional detachment, lack of trust, and strong desire to go against the grain set him up fairly well to be an assassin. The Frontline documentary seemed to conclude that Oswald basically acted alone, presenting some possible ties to organized crime, but not pursuing them in depth. This seems fairly plausible from what we've seen of the novel so far, he enjoys doing things alone and nobody seems to particularly like him very much either.
What I found particularly interesting from the documentary of Oswald's life though, was his strange behavior after killing JFK. He seemed somewhat aimless, carelessly killing a police officer, ultimately winding up in a movie theater and getting himself caught. Afterward, he was recorded shouting about police brutality and completely denying owning the murder weapon at all. This whole showdown struck me as somewhat out of character, since he's clearly a very smart and organized man who would plan for events following the shooting. It almost seems like he wanted to get himself caught, and this seems to strongly indicate that Oswald wasn't just acting alone. I tend to lean toward Oswald having sole responsibility for JFK's death, but the more facts I hear about the case, the fuzzier it seems to become. I definitely look forward to seeing how Oswald's character continues to evolve throughout the novel.
