Originally Posted by
Archdruid Aigaion
Here is my theory, you'll tell me afterwards what you think about it.
I am very passionate about lore, and during the BFA cinematic, one thing has hit me, it's Sylvanas' face when she sees Anduin's ray of light pop a bubble (seeming to be a Power Word: Barrier). Her face is the typical expression of "f*ck" when she realizes how powerful Anduin actually is, I mean, he's more powerful than Velen. As long as Anduin has faith in the light, chances are the Horde is doomed to fail. IMO, only, one thing can make Anduin lose faith in the light, seing Varian come back at Sylvanas' side. It is technically possible, even tho Varian's body was obliterated, because we know that Sylvanas used a Val'kyr to create a new body for Nathanos, so ultimately, all she needs is Varian's soul, and Bwonsamedi would pretty easily be able to bring it to Sylvanas if she makes a deal with him, you know, kinda like "Yeah if you give me Varian's soul, I'll give you all the souls I kill, deal ?".
Lorewise, The Alliance has always been honorable, but chances are this will change, because being honorable against an dishonorable foe doesn't make you win a war, and what does Sylvanas fear the most after the Shadowlands ? Seing Arthas come back. It might not be this expansion but maybe the next, chances are that we are witnessing the IVth war that might be longer than one expansion, but something is going on, the fact that we hear again from Bwonsamedi in an expansion where the two faction's leaders have a benefit to make a deal with him is another sign to me.