User blog comment:B214/Shin DxD 1 discussion/@comment-34061653-20180926000306/@comment-28884330-20180926014948

Crom won't defeat Ddraig, because that would equal Issei's team losing. And also, training more since Ddraig's return is barely over a month of training. Considering it took Crom hundreds of years of training to surpass Heavenly Dragon-class, a month or two won't be a big increase.