User blog comment:B214/Question and Answers 6/@comment-207.242.44.6-20190815185621/@comment-79.119.69.146-20191008162454

What about the aura? Issei has monstrous amounts of aura, an aura that is mixed with the aura of the dragon gods and the aura of the devil. Already his aura converts his soul into that of a dragon god. Once he awakens his powers he will be able to form a huge dragon over 100 m. At present Issei's race is that of a Dragon God (humanoid dragon). The CxC is a much more useful form than the jugguernaut drive, and since Issei has the body of GR, Issei is immortal, meaning it has an infinite life span, so if he wants to use the jugguernaut drive he could do so without repercussions.