User blog comment:B214/Question and Answers 6/@comment-118.172.205.177-20160711144501/@comment-118.172.205.177-20160711154110

i think the meaning of  complete and incomplete JD that ishibumi meant is like issei case with balance breaker.the complete and incomplete form look exactly the same but the method of attaining it is different.the incomplete form was attained by sacrifice his arm and the complete form was attained by increasing his stamina.so in JD case,it might be that issei "incomplete form" means that he didn't use it intentionally while the "complete form" mean that the user wilingly enters that form such as vali and the past possesor, but it appearance is the same.something like this?