User blog comment:B214/Question and Answers 6/@comment-35679297-20190912100222/@comment-35679297-20191008172737

You know that Ophis removed Infinity of DxD G because Issei's body, mind and soul weren't able to handle Infinity, so for the moment, Issei in P DxD uses Ophis' power without the Infinity, for using Infinity, he needs T DxD G. In P DxD G, Issei's attacks haven't the Infinity attribut.