User blog comment:B214/Shin DxD 1 discussion/@comment-175.138.188.184-20180926082732/@comment-28884330-20180927054010

Vali in DxD L, who is Heavenly Dragon-class, fought at least on par with Crom Cruach. Therefore Crom is not stronger than Issei or Ddraig by a large margin, and even at that, their special abilities can more than make up for the power gap. On top of that Issei has Ascalon and Ascalon II. And Xenovia, due to the Scabbard that makes her invulnerable, can keep Strada busy until the game is over.