User blog comment:B214/General Discussion/@comment-27180505-20170331135923/@comment-120.188.7.245-20170401144850

It was just his arm, who is to say that they could return his whole dragonified body into a normal body. My point is Issei had no control over his dragonified arm in Vol2 but now he has (close to 90% at least)

Don't get me wrong, i still think that your idea is still nice and i respect it but you know everybody has their own idea