I'll be culling a Del this month also for aggressive tendencies and none too stellar laying performance. A needlessly aggressive hen upsets the whole flock social structure and I never tolerate it...and she is rarely a good layer...never culled one for aggression that was also a great layer. Could have something to do with hormones.
Oh, my Dellie hasn't missed a day yet and lays a purplish egg. Ahh! I'm going to try to wait it out. It's a tough decision.