Re: The Dragons in The Winds of Winter?
I think the chances of Dany losing any dragon to Aegon are nil.
I don't believe in the magical blood of Targaryens, Dany has some measure of control over the dragons - but she is their mother, whether she is imprinted on them like baby birds, or their is some magical connection due to how they were born, I think that is Dany's connection to them rather than her family name or genes. Even that has slipped, although there are signs at the end of Dance that maybe she can bring the dragons back under her control at least to some extent, even without any magic horn.
I wonder if Victarion, having arrived in Meereen and helped in the defence of the city, but finding Dany gone, would be happy to leave instead with just a dragon or two. I think he may be. I know some assume Dany will ride in to that battle with the support of a new Khalasar, but I'm not so sure. In fact I think she won't - though of course it's just a guess.
I don't know if the Winterfell dragon exists. Where did it come from? Under the crypts? Surely Bran and friends who were down there during the sack of Winterfell would have noticed a dragon on it's way out? If it was somewhere else it would have to be somewhere that we haven't seen. Why did no one else see it when it arose, or since? It is an odd passage, someone posted it on here recently and it is more specific than I remembered - it made me question my assumption that it was just a prophetic puff of smoke seen through the eyes of an animal, or something like that, but I still can't entirely buy into the theory. I think more dragons are a possibility though. Maybe even an ice dragon. That would fit my personal theory of where the series is going quite well.