User blog comment:B214/Shin DxD 1 discussion/@comment-93.132.65.47-20180926201139/@comment-108.7.146.103-20180926232108

Except that Crom Cruach has literal centuries of battle experience compared to Vali and Issei. They may be well trained and experienced, but Crom has already seen and fought most of what there was to. That being said, Issei's Great Red side has yet to be fully awakened, and his use of Ophis' infinity is, (even if limited), a large boost to the power of Ddraig, and thus stronger than the Dragon's original form when going under DxD G transformation.