Participant Photo: Sharp-shinned or Cooper’s Hawk

This hawk killed a Hairy Woodpecker on one of my feeders. Several experienced bird watchers have been arguing about its identity. It appears to be either a large female Sharp-shinned Hawk or a small male Cooper’s Hawk. It has juvenile plumage, a light iris, dark streaking on the breast, a dark nape of the neck, squared off tail, a pale line above the eye, all suggesting Sharpie, but is it too big to be a Sharpie??