The dragon has three heads..Dany vs aegon vs Jon???? This JUST clicked what the fuck
when @une-nuit-pour-se-souvenir said aegon vs dany vs jon, i was wondering what threat could jon's army pose. they fought the lannisters, the ironborn, they will fight the boltons and the others. by the time they can join the war in the south, they'll be exhausted with a much smaller army. then i realised that maybe that was the point, the starks have been the underdogs so far and they'll remain that way but they'll win, it will take a lot of effort but they'll win. they all have their skills, bran's powers, sansa's political skills, jon's militarily skills and then there's arya.
so i know aegon will kill rhaegal (the dornish will provide scorpion bolts), i know euron will take viserion, and i'm pretty sure i know who will kill drogon- it's arya. basically arya is associated with bows and arrows, we see brandon snow (torrhen's brother) making a weirdwood arrow to kill aegon's dragon, the faceless men are looking for a book that tells them how to kill dragons. arya might end up staying in braavos longer than people think. long enough to learn what needs to be learnt, or she'll leave and bran will tell her. she'll be in king's landing, she's the only main character who knows the streets and has the seen the smallfolk going about their day (no riots, no jeering at cersei) so she'll be there while city burns. after she kills drogon. then daenerys dies. (credit to this theory goes to @rougeam