Valtroix and Rexxar are leading the mission in Tol Dagor. I don't know if I'd say Oculeth is leading anyone at Nazjatar, though; he's more directing traffic via telemancy. This is also a meaningless distinction as Alleria also isn't really "leading" troops at Lordaeron, she's more acting as a taxi-cab for a strike force and Anduin remains the authority of the Lordaeron assault. Similarly, Umbric is very much led by the PC during the Zuldazar assault. You're just moving goalposts here.