User blog comment:Jopjopjop/Volume 18 Spoilers/@comment-110.22.99.149-20150515122612

Even if Issei could transfer penetrate would Vali take it, some people seem to forget that Vali prides himself as being the strongest White Dragon Emperor, to get help from Issei i think he may feel he didn't do it on his own, also remember when Ddraig & Albion was trying to unlock penetrate what was the power that Albion unlocked, the way i read it that both was trying to unlock a power they had, not just what Ddraig had, so anybody else have an idea on this ?.