User blog comment:B214/Shin DxD 1 discussion/@comment-36663391-20180920083134/@comment-2208155-20180920104929

There are certain EX things happening, you can read that in EX page in dxd wiki... The War will be in 30 years.. He needs time to improve to be stronger than Ophis&Great Red and heavenly powers..

After this maybe feaw years later he will destroy 666 too .. Sorry for those who wanted Grayfia in Issei harem, Grayfia husband maybe returns in less than 50 years.