User blog comment:B214/Volume 23 discussion blog/@comment-77.188.244.180-20170422171022/@comment-30924344-20170422183037

Ok Issei was immune to the Sacred Gear Canceller ability when he was in his DxD armour. He stength was too strong for the ability to work on him. Vali couldn't do shit at that moment [with his own DxD armour he could now], but Rizevim toyed with Vali and then Issei slapped him silly. Something Vali couldn't do with demonic power, sacred gear power, and magic. Also lots of people have a natural talent for magic so that doesn't make Vali special.