Er, the ability to mass-summon and control predators and vermin has been a basic part of Dracula's powerset since the original Bram Stoker novel. How is a Dracula without that ability "normal", unless this is about the historical Vladislaus Drakulya?
Unless you mean something else, DC never lost the rights. Fawcett Comics had been out of business for about a couple decades, and Marvel made their own "Captain Marvel" to secure the trademark, which isn't the same as copyright.
They did this before DC started licensing some of the Fawcett Comics characters(before eventually buying the properties). Since Marvel owned the trademark, while DC could still use the name "Captain Marvel" in the actual stories, they couldn't use it for title name and whatnot.
Now, I don't have a source for this, but I'd figure since they were using "Shazam" as the central trademark for the title names, and that kinda became the brand, that's why DC stopped using "Captain Marvel" as the name after FLASHPOINT. But we see they still had the copyright when Earth-5 Captain Marvel showed-up in THE MULTIVERSITY and I think CONVERGENCE.
So yeah, this isn't the same thing. McFarlin straight-up lost in court, DC just decided it'd be easier to use "Shazam" as the character name since that basically became the brand.
Here's some stuff for whoever would be interested in the legal history.