User blog comment:Jopjopjop/Volume 19 Spoilers/@comment-24173056-20141122062809/@comment-24468758-20141122091150

In that sense Issei has 6 wings. Two devil wings, two BG wings and his own dragon wings. In that sense he is superior to Vali as he has "True Dragon" wings even though Vali is superior in nearly everything else.