No mod or admin permission necessary — it’s not a site run project, but purely community-based. You just have to be willing to stand by your decision. I would even go so far as to say if the breeder who originally released a line is fucking up, there’s no qualms with directly competing with them, if you’re being open and honest about your intentions.
Nobody has any rights over any genetics. It’s just a matter of giving credit where credit is due, and not stepping on toes unintentionally.