It's difficult to tell from the pictures, but I do not think those birds are homers. They appear more to be rollers or roller crosses. The suggestions about a 'settling' cage are the way to go. Secure the bobs in the open position, place settling cage on landing platform (if it extends up to the loft roof even better) allow the birds to be comfortable out there. They will even learn to dive into the coop at the arrival of a hawk. Later you can place them in the cage with the bobs down so that they learn how to navigate the bobs. Hokum's advice in post # 2 is excellent. Good luck with your birds.