User blog comment:B214/Volume 17 spoilers./@comment-24.2.168.254-20140220012350/@comment-1359322-20140220081456

To me it feels like a ploy all spell overed, Issei and all of his friends group together could hardly seal Grendel, Issei + Sairaorg was able to seal Grendel and that is after Issei defeats Euclid, that sounds overly convenient.