They know that John wasn't killed in prison, he died of AIDS and everyone in Cape Town knows that. The interview was all wrong, John does not do everything what he told Ross because he is a high ranking officer, only low ranks does it. The 28s do not control the 27s. John mislead Ross the info and I've heard that he infected a dude with HIV because he is a frans (non gangster). Plus, John is from Mitchell's Plain.