User blog comment:B214/Question and Answers 4/@comment-24502975-20141102214513/@comment-24468758-20141103174727

The amount of demonic power is not based on birth as Sairaorg has only a small amount despite being a pure blood of the house of Bael. There are devils who suck in using demonic power but excell at magic (as Lirenkus couldn't use demonic powers but was finally able to cast magic) as some people are better at calculating than imagining, so it depends on the devil whatever he prefers.