A Ghost of Someone

Oh yeah, Aegon will be Cersei's problem and he will have Dorne, much of the Reach, some of the Stormlands.

I think Rickon will live and continue the Stark name in the North out of Winterfell.

I would think an entitled young king / prince would probably not want a "used" woman like Margeary. Now, whether or not she has ever had sex before (we really do not know) but we have been told that her Maidenhead is not there anymore and she was married to Renly for longer than one night sooo.... maybe it was a horseback ride or not, she is tainted and possibly viewed as a curse, jinx etc. Just saying, given Aegon's description and persona, I do think he, Aegon will be seduced by Arianne Martell, that is what she does best but for a Queen, Margeary is a joke at this point.

On a related note, if Margerary manages to survive long enough, she will be considered for Aegon as well. The Tyrells and The Reach were Targaryen loyalists, although a bit incompetent with the exception of Lord Tarly.

The Lannister backers are a minority and at this point, A very small minority. However, many can be bought which is something the Lannisters can do now and then.

Littlefinger has more influence in the Vale than you think. Buying the debts of lords and ladies, blackmail and influence too. Now, the common foe is the Lannisters and the Vale has been chomping at the bits to fight, they wanted to join Robb. As far as the Ned thing, Aegon needs money and men to add to his forces. Food too, LF is hoarding that in particular and oh yes, Sansa is beautiful and a virgin, something Arianne of Dorne is not (since she has not been mentioned in a while here) I will just say it is a possibility. I am a SanSan believer myself. That is the one she really wants. She though, has very little agency at this time.

Ned was an horable man, only dishonorable people hate such (ie, Lannisters, Freys, to name a couple) Viserys was an unknown to Westeros in all but name and not missed and as for Sansa, I am sure she would like to get undone from the farce of a marriage to the Imp. I think she would be happiest with The Hound myself but Littlefinger still has control over her and who would be a better groom for her and advantageous for him, Harry, heir to the Vale or Aegon Vi, King of Westeros? Aegon/FAegon needs allies with men, money and supplies (food). Littlefinger and the Vale have all but it will come at a price to be sure.

Who did Ned "screw over"?

Finally, a man she can look up to.

SanSans is real. Believe it!

The only legit way I can see Sansa marrying i and be considered legal is for an annulment from the High Septon in King's Landing, whomever that is at the time she can get there. Whitnesses and or, an "inspection" by Septas should free her and this is important becasue of any potential claim of her titles and or lands or simply her in general must be considered legitimate. So, at some point, I think she pretty much has to get back to King's Landing. I cannot see her going willingly unless there is a new ruler in town and that very well could be Aegon/FAegon.

yes indeed.

Whether she is kidnapped out, attempt or not, does anyone think she really marries Harry the Heir or someone else is married to her or her to him at that last second in the Vale?

That could be but what I think is the ghost of high heart's prophecy, cleganes dualing over her fate is what I interpreted it to mean.

That is exactly what I think, he will have help. I think Sansa will find herself back in King's Landing for trial by combat. This will facilitate the long sought "Cleganebowl".