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Keep in mind GRRM uses unreliable narrators. Consider Stannis wasn't her "hero" at all. Melisandre consistently uses him for a different purpose.

On that same point, Aegon written out of the show isn't so much a disconnect as consistent writing. "When you play the game of thrones, you win or you die."

Since the Golden Company is composed of exiles and the sons of exiles, its participation implies a network of potential supporters in Westeros

Perhaps ponder who or what is behind all these machinations and repositionings.

Varys is the obvious master plotter, and in the tv show, Varys is now positioned to smooth the way for Dany. I will grant that Varys is fat and devious, and therefore might well be GRRM's alter ego (but then again, Varys is bald and GRRM ....). But book Varys backed Viserys and Young Griff/Aegon as well. So far, he has been only slightly more successful than Melisandre in picking winners.

There is every reason at this point to believe that Dany will be the ultimate champion against the white walkers. But Dany has three dragons. Aegon the Conqueror had three dragons, and two sisters as dragon riders. It is one plausible scenario that Dany will need two companion dragon riders as well. She has two possible half brothers and one possible brother still alive.

Unless a non-Targaryen can ride a dragon.