The 11th progenitor knew Ferid’s name. But when he heard it, he went into another screaming fit. “Don’t lie to me! It can’t be him! Ferid-sama is the 7th progenitor. If the blood you were given had been that of a 7th rank, you would have only possessed the strength of no higher than a 13th rank at best!”
Crowley had no idea how that calculation worked, but in short, it meant that he was given power by a higher ranked vampire. And it had opened an insurmountable power gap from the get-go. The difference in power between the 11th rank and 13th rank was supposed to be quite substantial