Originally Posted by
eschatological
I think Sansa is going to go on a similar path in the books, in that she becomes Littlefinger's pupil. I think she'll use it to destroy Littlefinger, but it will also destroy her (which may still happen in the show). I think it entirely possible LF brings the Vale North to help at Winterfell, for his own reasons, though. Sansa might very well be ensconced in Winterfell, not as Lady of Winterfell, but trying to pull the strings of Bran or Rickon (who should be Lord of Winterfell if they ever make it back).
Stannis, from the very beginning, even in the books, is portrayed as an unbending, unyielding man, and evokes the truism that the reed which doesn't bend in the wind, breaks. In his unbending view that the Throne is his, he's sacrificed his goodness to align with the power R'hllor can possibly offer him, killing his own brother via proxy sorcery. As he stands in the books now, he's marching on Winterfell, stubbornly, in a huge storm, because he can't think of anything but ousting bad people (which the Boltons certainly are). Jon isn't loyal to him (Jon is loyal to the Night's Watch), he is at best tolerant of him. The books made a deliberate point of Jon not bending the knee to Stannis. Maybe you could say Jon in the books supports Stannis for King, but that is because Jon doesn't really care about that kind of thing, and Ned supported Stannis and Jon is like Ned.