I had always thought that Dany was Azor Ahai.

As a Targaryen, she has the "blood of the dragon", she was (metaphorically) reborn in flame, and the "flaming sword" could be a metaphor for Drogon, her strongest dragon.

I could be wrong though. Might well turn out to be Jon.

I think they're going to resurrect him whether he is or not, though. I don't see why thy would have made a particular point of Melisandre turning up shortly before he was killed otherwise. My thought is that she now thinks that he is Azor Ahai.

She was wrong about Stannis though, so I'd say it's still anyone's game.