User blog comment:B214/Volume 23 discussion blog/@comment-31764731-20170418200747/@comment-31764731-20170419181441

As I said issei and Vali both are goning to surpass Shiva. Issei need to make sure, that Lith and Orphis are going to resonate. Also Issei needs to unleashed the power of GR. These are the requierments to use the actual DXD mode, without suffering.

Issei was normal guy were killed by Ryanar and was reborn as devil. He awakend his scared gear and begun to battle foes which were stronger than him. He survied the JD and find a different way to increase his power. As Azazel stated, that Issei would be incapble to seek the same power as Vali, because Vali use his huge deamon power in state his lifeforce for the JD. Issei awakend Trina and CxC. When his actual body were destroyed by Samule´s blood his senpais saved his soul. Issei was reborn thank GR and Orphis.

Orphis blessing increased Vali powers so he could use his DxD.

Both will get new power ups.