More like a light bulb that constantly flickers on-and-off due to not being tightly screwed in.
Every piece of evidence, every account, every piece of information that points to Oswald in any way shooting JFK or Tippit, in implicating Oswald in any crime, is attacked and dismissed. The person making the claim - Brennan or Brewer - is attacked as being dishonest (not wrong but deliberately dishonest). The evidence presented - the fingerprints on the rifle or the rifle purchase - is summarily dismissed as not being authentic, as not believable.
Meanwhile, all of Oswald's statements and acts are given the most innocent and innocuous of explanations. "Lots of people weren't interested in the assassination. Oswald was no different." As if nothing distinguished Oswald from these other people.
All of this occurring while insisting that he's not a conspiracy believer.