The irony here of course is that the "Oswald did it and did it alone" crowd chides the skeptical crowd for not agreeing on a single narrative, when they can't agree on what "conspiracy theorist" means.
Both terms are really not good representations. Would a person who believed that a lone nut did it, but it wasn't Oswald still be called an LNer?
Would a person who isn't convinced by the available evidence that Oswald was involved, but who also doesn't see any convincing evidence of any other particular person being involved still be considered a CTer?
How about-
1a) Convinced that Oswald did it and did it alone
1b) Not convinced that Oswald did it
2a) Convinced that more than one person was involved before the fact
2b) Not convinced that more than one person was involved before the fact