User blog comment:Jopjopjop/Volume 20 Spoilers/@comment-54.158.126.18-20150723000735/@comment-26285797-20150723034938

Now, to be clear, I'm not saying this is the final power-up because, let's face it, Ishibumi could drag this thing out however long he pleases. I know people hate the author card, but that's simply how it is. Don't let this stop you from imagining, just keep this in mind. Now in response to the Ophis/Issei fusion theory, I wouldn't put much stock into it simply because I think this has already happened PLUS, we still don't know just how powerful DxD Mode really is. Remember that Issei completely overwhelmed Rizevim even after taking a brutal beating from him and Belial, so the price he's paying for Ophis's power may very well be less than we think. Its still pretty unclear. But the power is definitely real. People keep on saying that his power is infinite, but I'm not so sure. Yes, Ddraig did say Ophis is infinite, but the current Ophis is not, so this may not be the fully powered form. Perhaps Issei may need power from Lilith to completely unlock the power of infinity. Now Vali needs more power because at this point, Issei clearly surpasses him in several ways.