It all depends on the environmental niche. The problem with dinosaurs being dragons is the KT boundary. However that does not mean that the DNA went extinct, only that many sequences were shut off in surviving species that may have been switched back on in the right enivronmental niche under the right circumstances over time. In otherwords something with dino or pre dino DNA survived and evolved closer to our own times by turning on those switches. Personally I think they could be mammals if the Bat Style Wing is correct, Armor is seen in Pangolins and armadillos, Egg Laying ability is seen platypus, the Claws, Teeth, Horns are all found in various mammals and flight endurance is clearly warm blooded.