So many ravens flying here and there, BUT...
We see Dany sending ravens to Winterfell, and see Jon reading it.
We see Jon reading the raven from Sam, about the dragonglass.
But why hasn't there been a raven from castle Black to Winterfell, saying , 'HEY guess what Bran is alive and well'.
We haven't seen anything of Bran in ep 2, but why wouldn't they immediately tell him that Jon and Sansa are alive and have retaken Winterfell?
Arya just heard that Jon is alive at Winterfell and she's headed there.
But she will arrive after Jon has left for Dragonstone. She will still be reunited with Sansa though.
Now let's get Bran into this mix. As the eldest legitimate Stark male, he's actually be ahead of both Jon, Sansa, and Arya in the line of succession. But he doesn't want to be king.