User blog comment:B214/General Discussion/@comment-1359322-20171216160100/@comment-2601:8C:601:5692:59FA:6A3F:1155:BF2D-20171229155341

They're not tamers, though they can appear to be. They are a clan that rules over dragons, the same way Furcas rules over horses, Vapula rules over lions, and Phœnix rules over fire and wind. Presumably, Baal's clan trait is to rule over destruction, Agares's is to rule over time, and Sitri's is to rule over water (and thus ice as well). On that note, Beelzebub's was to rule over bees. All these are cases where they can easily control the thing they rule over, taming is not required.