Huh? There are four Starks alive (Jon, Sansa, Bran and Rickon), and only Jon and Bran have been shown to warg. I mean, I think Jon’s one of the heads of the dragon, and I could see Bran warging into the other, but there’s no way Danaerys isn’t going to to swoop in on Drogon and barbecue some wights.