I don't buy that at all. Fredo was distinctly meek and unanimated throughout the Trilogy except during Michahel's visit to Las Vegas and during his boathouse encounter with Michael. If you are going to contend that his demeanor changed once Anthony was retrieved by his aunt prior to the fishing expedition, then it would support your contention to describe his demeanor in th emoments prior to that retrieval. I viewed his demeanor before and after Anthony's departure as relatively unanimated and unchanged.