O'Mara was on Geraldo together with Crump--he said Crump has been shown all of the evidence but he hasn't.
Corey can get away with this for now because most Americans don't know enough about legal procedures to know whether the prosecutor can leave out evidence that favors the defendant.
I think 12 jurors is standard throughout the US - hence “Rather be judged by 12 than carried by 6.”