[WalterBright]

The JS resurrection was not related to the zombies, as JS was able to resume a normal life.

If this could happen in the GoT universe, wouldn't you think that there'd be a massive effort by kings and others to resurrect dead family members? Or even talk about resurrecting them? There was no hint of that.

(Zombies violate the laws of physics, like conservation of energy, which makes it sad that most zombie movies try on some hackneyed explanation for them being the result of some virus. If you're going to try a scientific explanation for them, don't blatantly violate fundamental laws of physics.)