User blog comment:B214/Volume 17 spoilers./@comment-23853100-20140220152640/@comment-23853100-20140221021809

An argument on whether or not Euclid and Grendel being a ploy. Hmm lets see, Issei fights against Euclid, Ladon and Grendel all in one volume. In the previous volume, he could barely defeat Euclid. So unless if Issei improves significantly, i don't think he could continue battle continuously like that.