What Brennan swore to in his affidavit on 1/22/63 is the truth as he remembered seeing the events at the time of the murder..... He was not lying...... but he may have been confused about some aspects. It was only after seeing Lee Oswald murdered ( who he knew was innocent of shooting JFK) that he saw the light and decided to support the official tale.
That's an accurate, fair analysis. Brennan was hounded by federal agents to testify that the man he saw was Oswald. Brennan failed to positively ID Oswald even in the grossly rigged police lineup that he was shown, but, after being hounded by federal agents, Brennan later told the WC that the man he saw was Oswald.
Moreover, Brennan's description of the gunman's clothing does not match the clothes Oswald was wearing but does match the description given by four other witnesses who reported seeing a man in the window. Brennan and the other witnesses described the man's shirt as a regular "light-colored" shirt. However, Oswald did not wear a light-colored shirt to work that day. He wore a brown, rust-colored shirt that day, and he was seen in that shirt in the second-floor lunchroom less than ninety seconds after the shots were fired. I should add that two witnesses who saw the sixth-floor gunman said his hair was light-colored or light-brown, whereas Oswald's hair was solid brown and not light-colored at all.
Plus, new research regarding the witnesses who were near and/or on the TSBD stairs right after the shooting proves that Oswald did not go down those stairs to get to the second-floor lunchroom, as is detailed in the new documentary
JFK Revisited.