Frank Zane is cocky. No one can doubt that. Arnold was the king and I guess he wasn't pleased that such a small guy was winning the Olympia year after year.
If you look at some of the photos you will see that Arnold dwarfs Frank in chest, calves and arms. Frank places 3rd and perhaps was lucky because he was the reigning champion that year.
There is no way that Arnold would have felt that Frank was his equal on the posing platform or in the gym.
Look at the silly angles taken by the pro photographers. Since the seats were sold long before they arrived they didn't have the best positions available and were under, on the side, or even behind the competitors! Lucky for John Balik that I got him a seat for the finals beside me in the middle of the hall.
Here is the photo I took of Mike. Looked great here and Ironman used it for their cover. I photoshopped the image in the second photo. I will have to get access to the original slides to show even more detail, plus the other competitors.