User blog comment:IamJakuhoRaikoben/Chapter 372: Breach, Review./@comment-4489126-20140221150500/@comment-7418318-20140221160823

Maybe they were designed to work as a unit. Deliora and Lullaby type Demons in the front line with the Nine Demon Gates as forward scounts/infiltrators/saboteurs, 2nd row supporters and commanders.

By themsleves Deliora didn't seem capable of anything other than "go there and smash" tactics and Lullaby, apart from keeping hidden for a time, didn't seem all that intelligent either.