Well you definately have a nack for consolidating the discussions into a few links, which have helped me and others as well discuss and debunk theories.
Sansa? Hmmm, not sure about that one, but who knows. Even though i would like to think that one of the other dragons could be female. I personally would keep my guesses limited to the bastards from the Targ and Barathean bloodline for a possible dragon theory.
With all of the theories that we have broken down, i'm afraid George may not even be able to surprise us unless:
1) he adds additional character development for the current possibilities
2) bring in a wildcard character
3) we find out someone has been dying there hair all along or purposely going bald alla Egg
4) or leaves it wide open in the end, "for you to draw your own conclusions" (bittersweet ending as he mentioned)
I would be highly disappointed if the remaining books turn out like how the Dark Tower Series which kind of went in a totally different direction from the first few books of the series.
The only reason i referenced the DT Series is because of the long wait between, in which it gives the fans too much time to speculate with a fine tooth comb and it would lose its novelty when the dragons or other open ended plots are in fact introduced.
I'm sure George reads all of the theories and probably has read the answers to his theories and has to change it up a bit, unless he just has the beginning and the end done, but can't tie everything together.
He also may be just milking his newfound success by releasing/working on all of his other pieces of work while the iron is still hot so to speak. I'm sure everyone can agree that the anticipation is getting stronger rather that weaker in waiting for the next book release, especially with HBO onboard.
TK-421, since you have been helpful in providing links, can you point me to a link that may have all of the possible bastards or other characters that can be one of the dragons, with the reasoning either way for each?
For example, something like:
Aurane Waters: reminded Cersie of Rhaegar (best choice)
Gentry: Robert's ******* (Barathean bloodline, but not likely)