Now we all know the theory of azor ahai and a lot of people fit it like Dany, Jon, Gendry, Tyrion, Etc. But there is another who fits it as well Jorah Mormont and I believe he could be the one to save the world from the white walkers. He was reborn admits salt and smoke at dany's funeral fire with the smoke being the smoke from the flames and the salt being salty sweat of salt from the dothraki sea. He awoke under a bleeding star which was the red comet. Dany is his sacrifice, the blood of the dragon and awakening dragons from stone could refer to Dany. But I have my own twist it is said that a dragon must have three heads what if instead of it being three saviours it is three sacrifices. We know that the original azor ahai tried making his blade three times first in water then through the heart of his lion then finally the heart of his wife. This means there may be three sacrifices. Jon or Gendry being the water sacrifice as Snow melts into water and Gendry's last name is Waters, Tyrion being the lion sacrifice as he is a lannister and his sigil is a lion, and Dany being the Nissa Nissa sacrifice. This would be the bittersweet ending Bitter in the fact three of the main characters would die but sweet in the fact at least the world will be saved. Once Jorah has done this he will be Azor Ahai and save the world from the white walkers and the world will be saved (also if Jon is not the water he will be offered the throne but decline it and fly off on dany's last living dragon to never be seen again). And Either Sansa is crowned queen of the seven kingdoms with Bran as the new king of the north or (if this character is still alive by the end) Arya is crowned Queen of the seven kingdoms and Sansa is queen of the north with Bran going back to where the three eyed raven was to take his place.