What was Leavelle's role in the frame up? Other than expressing his opinion, based on the overwhelming evidence, that Oswald was guilty, he doesn't seem to have done much other than to be presented when your hero was shot.
Too bad that opinions aren't evidence of anything.
I like the old man and have spoken to him several times over the years. I respected what he believed to be true and he was honest enough to agree that whatever he believed might not be what really happened.
And you are right, Richard, as far as evidence goes, the only real claim to fame he has was that he was cuffed to Oswald when he was shot. If there was a frame up, Leavelle had no active part in it at all, but he may have been played for a fool and duped like just about every LN has been.