I have some light Brahmas, they have a color pattern similar to the Delawares, i.e., white body, darker head and tail. Any pure white birds I've had were the first victims whenever a predator problem came up, but the light Brahmas haven't really been bothered, much to my surprise. I would've thought the white bodies would stand out as a target, but apparently, with the head and tail shape harder to see, they don't. At least where I am, I guess it would depend on what predators you have in your area.
I'm looking to acquire some Delawares soon, they sound like wonderful birds.