I wouldn't breed him. It could be nothing to worry about, but it could be heritable. I would be hesitant to breed an animal if there's an additional concern that it may not produce healthy babies. If this defect is heritable, what if it's a recessive gene? You wouldn't even realize that the defect had passed down to the offspring, and might unintentionally spread the defect through your breeding efforts. Worst case scenario, people buy the carrier babies and breed them. All of a sudden this is common in local ball pythons. Best case scenario, it's not heritable and it might have been caused by an incubation issue. I think it's important to ask yourself whether the risk is worth it. Remember, there are more coral glow cinnamons out there. It would be a bit of a blow to your wallet, but it might help you produce healthier babies. He's a beautiful snake. Even if you decide to never breed him, I'm sure he would make a wonderful pet.