User blog comment:Jopjopjop/Volume 20 Spoilers/@comment-16281343-20150721123516/@comment-99.171.104.216-20150721164242

Vali did not amdit he is inferior to Issei, he just said that his family is what gave him strength. As his family accepted as their son despite being a devil, it increased his strength to protect them. Vali just wanted a family, but that bastard Rizevim killed his parents.