User blog comment:B214/Volume 23 discussion blog/@comment-27083298-20170415140706/@comment-10330822-20170415164559

Ajuka gave Issei a pretty big hint on how he can get stronger very quickly, he needs Ophis and Lilith to work in tandem. Then, he can use his DxD G form with ease apparently. I would think if that happened, he's be a real force to reckon with. So honestly, if he does that, he may be stronger than most of God Alliance by himself. I mean, we are talking about Heavenly Dragon-Class power here, Issei may become second to only Typhon on that field, maybe even stronger.