Where has it been stated? I want a source from Blizzard. You mean the countless Legion fanboys have stated it? In their eyes Kil'jaeden is still a lot stronger than Deathwing, even though we defeated him 2 expansions ago. And don't even give me the poor ''he wasn't at full strength'' excuse, ofcourse he was, if anything he would be more powerful than ever sitting in the sunwell. Yes, we won because the sunwell turned against him, but we were able to resist him for so long. Kil'jaeden is a mere whelp compared to Deathwing, just as Sargeras is compared to the Old Gods' combined might.