Just my hapence: The conspiracy that I am referring to is the one where rumors are spread and a forged letter disseminated in an attempt to invalidate the Rambam’s previous shitos. I think that is what you are implying must have happened.
Your question about Rav Avraham Ben haRambam is a good one. Maybe since his son was so young he chose to send the letter to an older talmid instead. I don’t know there are a thousand possibilities. I am not saying the letter was secret, only that there is only the one that he sent his talmid. The fact that the chazarah is not well known only means that the chazarah was not well known, not proof that it didn’t happen.
I don’t think it’s fair to paint me as a conspiracy theorist as though I want to believe in aliens and now I’m looking for excuses to validate that belief. For one thing, I gain nothing by promoting this idea. I have no agenda nor am i looking for an excuse to stop learning the Rambam c”v. There are sufficiently great enough Rabbis who believed there was enough evidence to declare in their seforim that a chazarah happened. You have questions on how such a thing could have happened being as certain figures didnt seem to know it. I dont know what actually happened, but as far as I understand it, all you are asking is why didn’t Rav X know. Who knows? For me it is simply a matter of some gedolim said something happened so I believe it. Bring me a Sefer that says that they were there and saw the letter forged and the rumors started and I will assume the former were duped. But I can’t just throw out the position of accepted gedolim on your questions. In the meantime I will assume Mahara”m Alashkar wondered the same thing but felt the question wasn’t strong enough to dispute his evidence when he defended him against the Sefer haEmunos.