Robnms,
Did you buy them as chicks? If they were sold to you as Delawares, then someone/someplace has had a great infusion of Columbian something or others in the background of their stock. Sometimes even breeder stock will hatch out the Columbian pattern from good Dels, I had a hatch with two roos that looked like that too. It is something we are trying to eradicate in the breed, and mine ended up in the freezer. I am really sorry, but your birds would not be good breeding stock. If you like them as roosters, do keep them, or process them, or find them good homes. But if you want to breed Delawares, then it would be best not to use them.