User blog comment:B214/Talk About What You Want! 2/@comment-24098614-20140905072647/@comment-1359322-20140905085909

The Sacred Gear extraction is Fallen Angel technology.

Devils take pride in the Demonic Powers they possess. It is something they inherit from their ancestors and will pass down to their descendants.

Just obtaining Sacred Gear is actually useless, they can extract it but it doesn't mean they can use it, instead it'll be better if they reincarnate the human holding it.