Re: Nalorakk, I don't see any specific limitations to druid tanking, insofar as I managed to tank it in very basic gear (HC set, t4 helm and gloves, t5 shoulders and belt of natural power, and the rest blue/kara/rep gear - nothing extraordinary for the level of difficulty at which ZA is supposed to be, my gear was rather entry level for this instance actually). I tanked the bear and another druid (with even worse gear) tanked the human form, so there's really nothing special to mention as far as "t4 druids" tanking it are concerned. So the bottom line is that any vaguely decently geared t4 druid can tank it, be it human or bear form, and there's little need to split hairs on such a basic, tank and spank fight
As Boevis and I pointed out, though, a warrior + druid combo is preferred overall for this instance, but I've not seen anything in the encounters design that would not work with pretty much any combination of tanks. All in all ZA looks to me as being very intensive on healers requirements, much less on dps/tanks requirements, not only first fight but all fights. A badly geared tank is much more likely to die from healers not keeping up (also due to raid damage in general) than from spike/unlucky damage (as in, a bleed is a bleed no matter what your class/gear, and proper execution by the tank is going to help much more than just crossing fingers not to get a 3x crushing thrash in 1 second as in another pro-warrior encounter that shall not be named).