Having Marina testify that Oswald hated JFK isn't anything remotely like a "Manchurian Candidate" and something that, it seems to me, obviously would have been done if you believe she was coached or coerced into testifying.
Again: if Marina said what the government wanted her to say out of fear of being deported - as many Oswald defenders claim - then why didn't she say Oswald hated JFK? It provides a clear motive and a direct line to shooting of JFK; motive, something the WC couldn't determine. In fact, Marina said he liked JFK something that makes no sense at all except to those who defend Oswald at any cost.
De Mohrenschildt said Oswald admired JFK. If De Mohrenschildt was part of the CIA plan to frame Oswald that makes no sense.
The Oswald defenders don't want to address this simple question: if the investigation was a charade, a giant lie then why not have these key witnesses provide a motive? It's understandable they don't want to answer it; if I was an apologist for him I wouldn't want to deal with it either.