User blog comment:B214/Light Novel Volume 16 spoilers/@comment-23853100-20131029020955/@comment-3125355-20131030132232

Ah, now it makes sense. It's weird almost every BB we see in the series is a sub-species.... All but Issei.... so this sub species BB Holy Grail is supposedly 3x as strong as the normal one? kinda like Seigfrid's twice critial BB having 3 more arms?