Gary, I have fished for grey mullet for more years than I care to remember, certainly in excess of your age. The fish in the picture are between two and three feet long, way beyond the size of any grey or golden mullet I have ever seen.

The fish jumping out of the water were very possibly grey mullet, they certainly weren't YEMs, but what was chasing them? I will stick with the scenario of Kingfish, along with the guys who had balloons out with a live bait under them. They had the chance to see the fish and I think they knew what they were doing.