Thread:B214/@comment-26473512-20150607112638/@comment-3965848-20150607194112

@B214 I'm pretty sure JD isn't a curse, it contains a curse that influences the user to go into it, the form can be used without the curse or any drawback like Vali did and it also isn't a "seal" for it unleashes/unseals the full power of the Heavenly Dragons.

If fake Issei can use JD it would be because he was made with some of Ddraigs power. I'm sorry but I think my theory makes more sense.