User blog comment:B214/Shin DxD 1 discussion/@comment-34061653-20180926000306

I could be wrong but I believe that if Crom and Ddraig fight, Crom will beat him. According to spoilers, Crom stating he has been cultivating ever since Ddraig's return. This could be a way for Issei to reach the next level or he might use True DxD G.