User blog comment:Stbk22/Possible Power up's/Techniques for then new group DxD/@comment-1359322-20140108063746/@comment-16281343-20140205052701

@anon: JD and BtB are not the next level for SGs.

First, JD are exclusive to BG and DD, and BtB are exclusive to SGs that have creatures sealed inside them.

Second, JD and BtB are activated by just unsealing the full power of the creatures sealed inside them.