Most people agree that a man calling himself Oswald visited Mexico City for a few days between the 27th of September and the 2nd of October. Most people agree that he went back and forth on the 27th between the Cuban consulate and the Soviet consulate - trying to get a visa to visit both countries and failing at both - with one last stab at the Soviet consulate on the 28th.
At the Cuban consulate, consul Eusebio Azcue insisted that the man he met was not Oswald. The other consul, Alfredo Mirabel, was equally insistent that the man was Oswald. This kind of sharp division makes it hard to determine if Oswald ever came to Mexico City. Jack Whitten, who was the CIA’s original investigator of the assassination, wrote in the days after 11/22 that “no source then at our disposal had ever actually seen Lee Oswald while he was in Mexico". That is remarkable, as the CIA’s sources inside the Cuban compound later told House Select Committee on Assassinations staffer Ed Lopez that the man who visited them was not Oswald.[ 111 ] For ease in writing this narrative, I will refer to the man at the center of this Mexico City narrative as Oswald, but I remain an agnostic as to whether he visited the Cuban consulate on the 27th, or even came to Mexico City. I’m convinced that he didn’t come to the Cuban consulate on the 28th. - Bill Simpich
https://www.maryferrell.org/pages/State_Secret_Chapter3.html
A fair analysis today, however, suggests that the real Oswald may indeed have visited the consulate at one stage on Friday, September 27, but that an impostor may have been involved at a later stage of the contacts with the consulate. A phone call from the Cuban consulate to the Soviet embassy on Saturday, September 28, in which Oswald was supposedly a participant, almost certainly involved an impostor. If that suspicion is correct, what was going on? - Anthony Summers, The Kennedy Conspiracy (1980)
Jon, my original question/point was to address the claim that Oswald was impersonated at the Soviet Embassy, in fact that he never went to Mexico City at all. I think the evidence is persuasive that he did go there. Why would the Soviets cover up or withhold this impersonation? What would be the reason?
One of the claims refuting the three KGB agents who said it was Oswald is that they "defected" to the West and made their claims for financial or other reasons. In other words, they lied. The fact that they informed Moscow shortly after the assassination that the man they saw was Oswald - an erratic and unstable Oswald - disproves that claim.
As to the tapes/phone calls: As Rudd said in his cable, the tapes had been erased. There were none. Why would they be kept? We have the transcripts and there's nothing of importance to keep. Why keep these when the usual procedure was to erase them? This was 1963, the tapes were huge devices. I think Coleman and Slawson's accounts - which have been contradictory, e.g. Coleman said on one occasion he heard no tapes and on another he did, same with Slawson - that they heard tapes is wrong.
As to Simpich and the Cuban consulate: Nowhere does Lopez mention in his report this CIA source's account. How would a CIA source know this? According to the Cubans there were only four people who were aware of the visit: Azcue, Duran, Mirabal and reportedly Teresa Proenza, the Cuban Cultural Attache who supposedly directed Oswald to Duran when he entered the consulate). Who else would know that some person identified himself as Oswald? Duran, who spent the most time with him, said it was Oswald (yes, she got his height wrong). The physical evidence - photos and signatures - are of Oswald's. He told the Soviets he went there. So we have Azcue saying it wasn't Oswald (he also said the photos were not of the man he met?) and all of this other evidence?
As to an impersonation: If one did occur on a phone call how does that show a conspiracy in the assassination? I don't see a connection.
In any case, I think Oswald did indeed go to the Soviet Embassy and meet the KGB agents. And according to Nechiporenko's account he mentioned visiting the Cuban consulate. Unless he was lying, that shows to me more evidence he did go there as well.