I can't see the head in my picture, but from the size I would guess it was Trey. His wings have to go so much wider because he is smaller. The blog had a picture of Trey being a shade a couple of days ago and his wings were much wider.
Yesterday the bird on the nest had a hard time covering everyone. The bird left the chick huddle. Shortly after Princess arrived on camera, headed for the well fed chick huddle. She settled in over the chick huddle, which she was big enough to contain them within her legs.
In addition I don't see the "crown" or spots at the back of the head, so I am guessing Trey.
It is good to see all the chicks getting so big. I used to worry about one not getting fed, but they all are so much bigger, that seems like a false worry.