The title of this article is conjectural!
Although this article is based on canonical information, the actual name of this subject is pure conjecture.
After hearing Howard Link's report about Allen's condition, he stated that Allen is intelligent, calling him a limb of the Devil. When Zu Mei Chan tried to ask him to be mercyful, the Cardinal coldly ordered him to shut his mouth.
After Allen Walker escape from his cell with the Noah, a special meeting is held with the high-ranking members of the Black Order, including presumably the cardinal.