Yup, he's probably a grandson or great grandson of Isaac's. You sure know which ones are boys very early with these, don't you?
ETA: Folks who don't know Delawares sometimes think you have a mixed breed when they see all the "smut" they have as babies, but they don't realize that this breed undergoes many, many transformations in their plumage as they mature. You see how dark my little man's wings are already-that is pretty typical of Georgie's sons. I just hope he'll have good Delaware color because, often, Georgie's sons are just so dark in the hackles and tail. Her daughters are her strong suit, but she never produced many of those.