Originally Posted by
Zulkhan
There's really nothing to "warp". You simply don't mention him. You don't show him. Because, indeed, even in Rise of the Horde he was nothing but a background figure, a role that pretty much ended with the near extermination of the Draenei. If you look at the same story from the perspective of the Orcs, you have no fucking idea of who or what Kil'jaeden is, because he constantly played "behind the scenes". Kil'jaeden may have manipulated Gul'dan's thirst for power, but is Gul'dan who manipulated the Horde. Gul'dan is the schemer that matters the most. He's the one who manipulated an election to turn Blackhand, his egomaniac puppet, into Warchief. He's the one who constantly sold lies to the orcs to make them act as he wanted and that's because of his own agenda, because he wanted to become a God. He obeyed Kil'jaeden's and Mannoroth's orders to follow such ambitions in the first place. When he got clearly deceived and abandoned, Medivh/Sargeras became his new benefactor. And that's where the actual plot of the First War begins.
Kil'jaeden matters as material for the "world-building" in potential sequels. He would matter as reference in a potential "Beyond the Dark Portal" movie where a reason to get more details about Ner'zhul and Kil'jaeden makes sense. This first movie needs none of that, though.
Mannoroth was summoned on the Black Temple. The blood drinking occurred on the Throne of Kil'jaeden. All Mannoroth literally did was doing a cut, filling a cup with his blood and give it to Gul'dan. It was the job of Gul'dan sell enough bullshit to convince the Horde about drinking that shit. Heck, how you were supposed to manipulate the orcs by showing one big-ass demon right besides you?
Sorry to say it, but your headcanon is not going to make this pitiful excuse of an argument any less stupid than it actually is.
Ner'zhul was deceived and "pushed" where Kil'jaeden wanted, only to pussy out when he realized how bad he was fucking up. Gul'dan did not need "pushing". He conciounsly and willingly betrayed his mentor, allied with Kil'jaeden and sold his people for personal power. He was never "lost" to anyone, he never served anyone out of loyalty, always for his personal gain. The only one towards Gul'dan was truly loyal was himself alone.
The only relevance demons have is how Mannoroth's blood corrupted the orcs. This is trivial. What matters is that they got corrupted by such power and that Gul'dan is manipulating them for his own agenda. Mannoroth being the source of the corruption (and a rough drawn in one of the sets pretty much confirmed Mannoroth's existence in the movie universe as well) is an unecessary detail when all he did was simply offer to Gul'dan the means to manipulate and corrupt his people.
What you failed to get until now is that this very movie casts a first hint about demons and their connection with Gul'dan and the powers he got. I could spoil little bits of novelization so I'll put the rest tagged.
How? Simple, Medivh. Medivh [I]is[/I] possessed by a demon, one demon we know very well. He's in contact with Gul'dan and, as occurred in the game lore, Medivh/Sargeras is the one who made all the promises of power to Gul'dan. He's blatantly possessed by a demonic entity and connected to fel magic, the very magic Gul'dan used to fuck his world up. That's quite enough to hint that something's more was behind Gul'dan, beyond the fact that he's a mastodontic asshole by his own. It's the hint that he got his power from someone, arguably a similar entity to the one possessing Medivh.
This clarify things? Not at all. But definitely hints lore aspects worthy to be addressed in the sequels. This movie's story, however, perfectly works without them.