User blog comment:Crimson and Darkness/Volume 25 discussion blog/@comment-39.33.238.88-20180427023452/@comment-28884330-20180427183607

Not quite as simple, since Issei defeated Vidar by taking advantage of the weakness of the dragon armor with Ascalon and Ascalon II. Although it’s pretty much sure that DxD G is stronger than Forbidden Invade.