The color genes that makes an orange roan or a reds are all recessive. If you produce red or OR you know that they received a recessive from both sire and dam. Both dogs have to carry for the recessive in order to get the color to be expressed in any of the puppies. The solid black and the Blue Roan color genes are dominant. I don't think the sire this time even "carries" for OR but he had never been used before so if there is an OR anywhere back in the generations behind him it can be be passed along as a hidden recessive for generations until it finds another recessive. (Just think of it as high school biology class about genetics!
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When Blondie (an orange roan) was bred to Izzy's sire who was a blue roan.....we knew that Nickolas carried for Orange Roan.....Then you deal with statistical probability as to if the gene with match up and be expressed. Three of the four pups in that litter where OR.....a much higher percentage than average.....