If Galactus had never come to Earth, who would have been the strongest of the Marvel Zombies? I vote Ghost Rider. Think about it. There's nothing to rot, which means his strength really doesn't decrease, and so, when everyone else is decayed and their sinews and arteries are all torn and destroyed, GR is still going strong, since I don't think Hellfire would be affected by his being zombified. If anything, such an evil power would probably only strengthen from such a newly evil wearer.