[sphinx]

I assume there's no reference to this in GRRM's books, as he's still writing more books

That depends on your theological perspective on Westerosi prophecy. If Jon comes back, he is someone very important. But maybe the prophecy is hokum.

[Darnright]

I’ve read the books. I’ve not watched much of the series. From my perspective, it’s not Jon Snow who is the very important Stark family member. Bran, on the other hand, is the one to watch.