User blog comment:Piyush Banerjee/Shin DxD 2 discussion/@comment-78.48.6.54-20190113221154/@comment-87.4.190.158-20190118134513

No I'm not. Issei has already Ophis power within himself. When he used the full power DxD he used Ophis and Lilith's power too, not just his own. Issei doesn't need to receive more power from them. He just need their help to finally balance his own power so he can bee more stable once he unlock GR's power.

Issei with the DxD simply did what he had already done when GR granted him his own power once he and Ophis saved his life, when Issei became a giant scale mail to wipe out the Annihilation Maker creation. Once he was done, that power returned to GR, as he did to Ophis after he used DxD. In both occasion he used power from someone else. Issei doesn't need Ophis or GR power, he already possesses a fraction of them within himself, he only needs to unlock the latter and learn how to make them work at the same time.

If he wants to power up the power of Ophis and GR within himself he doesn't need to receive a boost by Ophis or GR, he just can use his SG to boost the fraction inside of him.