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I checked with the color calculator to make sure I'm correct. If your Delaware roo had a cream or yellow look to his body, he wasn't a true Delaware. If crossed to another carrying his same color genetics [the hen would look pure Delaware in color] they would indeed produce a percentage of red hens. True Delaware roos have a silvery white colored body.
ETA: I had an off colored chick hatched from a setting of what were supposed to be Orpington eggs shipped to me, he was yellow and feathered white with columbia pattern. I thought at first he might have been a Lt Susssex from an egg from the adjoining pen that got mislabeled, but his feathers are yellowish now in places so I know he's a Lt Sussex X Orp cross. Like your roo, he's very large and meaty bodied, I may use him in my meat project.
I suppose I should be more clear in my explanation. Silver is a color gene that is expressed as a very white feather that doesn't show any yellowing. It is also sexlinked; if pure for it, one copy is tied to the male chromzone of roosters. The impure hens can look very clean, but the roos develope a yellowish to gold appearance depending on the pattern genetics that accompany it. Since the hens can only carry one copy, when they're crossed to a red male the female offspring will be red, but the males will all carry one copy for silver and appear white, though it will be an off-white or possibly even gold. Red sexlinks are produced by a red roo over silver hens. That is why you can't take a red roo over just any white hen and get a red sexlink chick; the white hen has to be silver based and not just recessive or dominate white alone.
Those papers might come in handy someday...
