I was under the impression that prior to Expunge, there was no way to remove a Zombie from your scroll. And yeah, it mostly doesn't come up with how deliberate and difficult they are to create, but if you happen to change your mind, at least you can do something about it now.
Royal Crimsons grew up, time for my glitterballs!
Sparkly!
...I don't care if those other four aren't Soulpeace eggs, they're glitterballs in my heart!