Thread:B214/@comment-26473512-20150607112638/@comment-1359322-20150607132447

If you check back around 8:23, you'll notice that the fake Ise is actually created from the fragment of the Scale Mail after the JD.

Presumably because Rias' tears touched the armor, the curse materialized with that fragment and Rias' feeling as a catalyst, creating a fake Ise. So being a product of the JD, the chances of it being able to access the JD is high.