re: Crackpot ASOIAF Theories SPOILERS

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BUT, Jon is not immune to fire like Dany, which puts a major dent in the idea of him being a dragon rider.

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Dany isn't immune to fire, she actually burns her hands at one point in the series. The dragons being born was due to the blood magic with her burning the witch and her hubby.

For further confirmation, a couple quotes from GRRM:

In 2000 GRRM wrote in an online Q&A (emphasis is his, not mine):

Granny: Do Targaryens become immune to fire once they "bond" to their dragons?
George_RR_Martin: Granny, thanks for asking that. It gives me a chance to clear up a common misconception. TARGARYENS ARE NOT IMMUNE TO FIRE! The birth of Dany's dragons was unique, magical, wonderous, a miracle. She is called The Unburnt because she walked into the flames and lived. But her brother sure as hell wasn't immune to that molten gold.
Revanshe: So she won't be able to do it again?
George_RR_Martin: Probably not.

And, in 1998 he wrote:
"Lastly, some fans are reading too much into the scene in GAME OF THRONES where the dragons are born -- which is to say, it was never the case that all Targaryens are immune to all fire at all times."