User blog comment:Jopjopjop/Volume 20 Spoilers/@comment-26285797-20151203030431

I just had a thought about how Vali might power-up. Mind you, I know a ton of you are already going to disagree, but hear me out. Vali admitted that Issei had something he did not in Vol 20, so perhaps Vali will seek out his human mother, learn something about himself and his EJOD form will become even stronger. I know this does not sound like Vali, but it does make sense after the events of Volume 20 and also he is finding out things about himself that will make him stronger.