Thread:B214/@comment-26473512-20150607112638/@comment-1359322-20150607144633

Ddraig isn't the cause for the JD, JD is a seal God set in the BG & DD. The JD itself is a curse, when the possessor of either gears fall into deep despair or rage in short negative emotion taking over, it unleashes the power of the 2HD but the users goes berserk completely and it trims the users' life.

The reason why Euclid can't use it because he created a fake BG using the remains of Ise's previous body. In this case, the fake Ise is created as a byproduct of the JD itself, even a fragment of the Scale Mail after the JD should have a tremendous amount of Ddraig's aura, and fueled by Rias' jealousy, a form of negative emotion itself, there's a chance that it can use the JD.

P.s. I never said the fake Ise will definitely be able to use the JD, i only said might.