It might make Garrison (DA in the Oliver Stone movie JFK) less interested in bringing a guy to court. And more focus on Oswalds personality would give more attention to his defection to Soviet Russia. So less blaming the CIA and more blaming of the KGB...
This has the amusing possibility of getting various Soviet KGB officials to tip at least something at the trial--probably something to reveal just what a wacko he was.
IN any case, Oswald is an unbelievable character. If he claims a set up, in the courts, how would that have worked out? Indeed, it's not possible for a single man to kill the US president. He would claim to be a patsy, and the Magic Bullet idea would be put to rest entirely.
If Oswald is able to prove he's a patsy, this whole thing might just melt down.
Or, more likely, Oswald commits "Suicide" sometime during the trial.