Guess the only way Kudlak societies and his blood takers to win is to change their old ways or else, they'll lose to Amphis group and their unexpected help with the police force.
Something tells me Keigo will help them adapt to his century. It seems they haven't had any new retainers for quite sometime until Momo turned him. He might despises them but he refuses to see his police forces being taking advantage by his enemy to wipe those who get in his way.