Hi Paula, if your breeder is correct than you'll have to trust that's what it is. Did you see pics of the parents ? The 3 morphs that are visible are the hypo [ clear nails ] the leatherback and the G-stripe [ genetic stripe ] The hets are hidden and may not prove out even if he carries them unless you breed him to a female that is a certain percentage of the other 2 morphs [ trans. + witblit ]
But if you've seen the parent dragons then you can see what he carries genetically. He is very pretty, love the racing stripes.