Reskins, reskins and more reskins. Same shit given a new cover and sold to us as new. That's what 10m+ subs get you.
No, he was getting his ass kicked by Deathwing. He'd taken out every other dragon sent up against him though. The gronn are described as 'demigods,' so I put Gruul at Cenarius' level power - at or about the same level as the animal demigods of Azeroth, but beneath dragon aspect power.
And Kil'jaeden at the Sunwell was really him. You could argue that he hadn't come completely through the portal, but I don't see how that would affect his power. Maybe he was sucked back through before he could bring his full strength to bear. I'd still put him below Old God level.
Well, it's not like the subscribers are working on it.
If you like my draw-rings. http://yig.deviantart.com/
My WOW character sketchbook: http://yig.deviantart.com/gallery/40397043