User blog comment:SpookyBoogie27/Light Novel Spoilers/@comment-8.28.150.75-20140210041712/@comment-1359322-20140211143451

Who knows but i doubt it's much, his body is just that of a Dragon right now, aside from that nothing is different from before, even if the flesh is from Great Red's body with Ophis' power, it doesn't mean Issei will gain similar abilities or powers to Great Red or even Ophis.