User blog comment:B214/Volume 23 discussion blog/@comment-31137559-20170413122356/@comment-30924344-20170413162753

Yeah just for them. Issei's EP gave him CCQ/CCP, Illegal Triaina and Promotion without Rias' consent. Those are EP abilities, not Issei's own developed. Diehauser has to understand how the EP formed those powers in the first place. Those are just three of many secret abilities the EP has.