I’m keeping a tab on your conspiracy theory—so far, we have Oliver Cowdery, Martin Harris, and Emma Smith as coconspirators with Joseph Smith, right?
How did you get that? I can't speak for marg, but under what I think is the most likely scenario, we have Oliver Cowdery who might be classified as a "co-conspirator" but probably not in the sense you are thinking of. Under my thesis he would simply have been privileged to information the others were not. But even he might have still believed Nephites were real and that the ms pages being supplied to them by Rigdon represented a genuine history combined with true revelation. He would have also believed that Joseph was selected by God to finish the work, add his own revelation and present it to the world. So in that case, he would not have been a "co-conspirator" as you are likely using the term.
I am convinced that we should be viewing all of the early Mormon followers of Joseph Smith in the same way we view modern followers of Warren Jeffs or Benny Hinn. It is difficult to determine whether such followers truly believe in the claims being made by the charismatic leader or they simply see an opportunity, but either way, they are not usually inclined to report information to the public that might be damaging to the cause. And any report they do give is calculated to put the cause in the best possible light. That is exactly what we see with most early Mormon witnesses. And of course, those who broke the mold, were labelled apostate pawns of the devil.
Viewing the witnesses in that light would reveal that they ALL were co-conspirators in exactly the same way the followers of modern cults are co-conspirators.
When you theorize that Oliver may have been instructed by Joseph to copy the KJV with the changes he (Joseph) had made to the text, you are agreeing with me that, at least in that sense, Oliver was indeed a co-conspirator. I realize you will object to that since you think Oliver would have been sincerely duped by Joseph Smith, but in actuality there is no ground for such a protest. There is very little actual difference between your position and mine with respect to Oliver's status as a "co-conspirator." In other words, if you are going to charge my version of S/R with accusing Oliver of being a "co-conspirator" then you will need to apply the term to Oliver in your theory as well. Under both scenarios, Oliver believes Nephites are real and Joseph is chosen by God and therefore has the right to ask him to copy the Bible with the changes he's made to it. The only real difference between your position and mine (that I can see) is Oliver's state of mind and rationale for never mentioning the Bible, and, consequently, what he would have stated had he ever been directly asked. As far as I am aware there is no way to prove it either way, so in a practical sense, there is essentially no difference between your position on Oliver and mine other than the volume of secrecy and the motivation for silence.
As far as the others, they fit very nicely into the view that they are simply devoted followers who would tend to publicly state only things that will support the cause and reluctant to mention things that might damage the cause. But those who were lower in the hierarchy would simply not have been privy to certain information.