The ASOIAF forums are actually really good for debates like that. They've got so long to waste inbetween books that they've somehow managed to make even the most ludicrous theory seem possible (Hot Pie is Azor Ahai ).
How on Earth they had that conclusion?
Except the Snow being Rhaegar and Lyanna son, I never read on ASOIAF forums. Anyway, thought that it was generally accepted that either Jon (very likely) or Stannis (less likely) is Azor Ahai.
Would prefer Hot Pie though. Or Lord Piggy.