I never argued about the capability to handle the Amani if they had the whole of their army pushing against Zul'Aman (not forgetting however that Vol'jin's warning gave them the capability to properly prepare before the Amani made a single move out of their city) just about the fact that in the actual situation they couldn't, which leave unchanged my point about Theron being quite clueless regarding the situation on the field.
Against undead is obvious, they're not living beings. Against demons, it depends how much they can be considered alive or not. But ofcourse some powerful Eredar could use some sort of necromancy to undo Zalazane's protection or something, I suppose.
No doubt, but nothing change that Gul'dan couldn't achieve near-immortality at all. No way Doomhammer would have been able to threaten him if nothing living was able to harm him. And surely, if Gul'dan was capable to mind-slave plenty of people like Zalazane did, he wouldn't have to care about the honest or supposed "loyalty" of his subjects in the first place.And as much as i consider gul'dan to be a joke now, in AU he kinda got butchered by demons outclassing most of things we seen. They seem to like that sargeras-fella alot.