A very seasoned Asian birding expert sent me an email suggesting that the bird looks right for an Intermediate Egret. I can’t be sure if there is or isn’t a dark tip to the bill into photos. As Dave Irons wrote, Intermediate Egrets usually have a dark tipped bill, but apparently not always.
I hope someone gets sharper photos. I also hope no one does, because if it is an Intermediate Egret, I don’t want to fly back to Oregon from Tucson for it (like I have for two other birds in past years).
Great Egrets do of course vary in size based on sex, and somewhat so by individual.