How Drogon Is The Best Match For Both Prophecies
At first, selecting a dragon to be the Prince That Was Promised, Azor Ahai reborn and the Stallion Who Mounts The World might seem ridiculous, but the evidence to support this theory is strangely compelling. As outlined by the Reddit theory, Drogon is the only character who clearly fits not just the criteria to be Azor Ahai reborn, but also that of the Dothraki's Stallion.
For starters, Drogon is born "when the red star bleeds" because the red comet first emerges the night he and his siblings, Rhaegal and Viserion, break out from their eggs. This happens at the end of a long summer, just before the winter starts and White Walkers come south (aka "the darkness gathers"). Khal Drogo's funeral pyre provides the smoke and Daenerys' tears the salt necessary at the moment of his birth, and Drogon is literally a dragon "awoken" from an egg that was thought to be petrified stone. Most notably, Drogon wields a weapon as powerful as any Lightbringer - dragon fire.
As for being the Stallion Who Mounts The World, who can claim to be swifter, fiercer, bolder (with a thunderously loud roar), and strike more fear in those hiding behind stone walls than a dragon? The language of the Stallion Who Mounts The World prophecy is remarkably like the description of a dragon - and not just any dragon, but Drogon, a dragon who is traveling across the world with a massive khalasar at his back - and by virtue of being Daenerys' son, Drogon is also a prince. Interestingly, because he is also a dragon and cannot ever actually succeed Dany and become king, Drogon will always be a prince - the Prince That Was Promised.
What This Means for Drogon In Game of Thrones Season 8
For Drogon to be revealed as the Azor Ahai reborn and the Stallion Who Mounts The World, somehow making him the savior figure the Prince That Was Promised in Game of Thrones season 8 would be absolutely bonkers. That's not to suggest it's impossible - as argued above, there is evidence to support the claim - but having a non-human, non-speaking character like Drogon named the Prince That Was Promised would surely be a letdown to many in the audience. Then again, perhaps such a reveal would best illustrate the folly of putting so much stock in prophecy - as both many characters and fans have done.
If anyone is expecting the reveal of the Prince That Was Promised to be some grand moment where the heavens part and light shines down on R'hllor's anointed chosen one, then they haven't been paying attention to the story Game of Thrones is telling. As is the case with both the A Song of Ice and Fire novels and the HBO series, Game of Thrones is a subversion of common fantasy tropes and it's therefore very unlikely this story ends with some savior hero single-handedly slaying the Night King and saving the world. And just because there are prophecies littered throughout the world of the story that predict just such an outcome, that doesn't mean that's how the story will end.
As for Drogon actually being the Prince That Was Promised or some other such hero figure, it may not matter all that much in Game of Thrones season 8. Drogon is certainly going to have a major role to play in the war against the White Walkers seeing as his dragon fire is an immensely effective weapon against them. And, in the end, winning the war is more important than crowning some savior prince.
Game of Thrones season 8 premieres Sunday, April 14th at 9 pm on HBO.