Zeon Lucas eventually chose to compromise. In fact, his compromise was widely expected: for an old Blood Clan member who scrupulously abided by ancient etiquette, it was difficult for outsiders to understand the weight of his position and his seniority in the clan hierarchy. And even if he did not give face to other elders, there was no way to ignore Vivian, the special elder.
Influenced by the subtle pressure from the senior elder, who had witnessed all the events of the Mythological Era, Hesperides, who could make the situation more complicated if she intervened, and Hessiana's family who had significant influence in the current precarious situation, Zeon Lucas finally made a smart decision. To relax the restrictions of the stubborn creed did not necessarily lead to much loss of interest. It would have been unwise to offend a lot of people for the sake of face.