From the first episode, I always thought there was a huge connexion between the wolves and the Stark's young generation :
- Lady had to pay without being at fault, like Sansa who constantly had to pay for others décision (scapegoat for Joffrey, forcefully married to Tyrin & Ramsey) .
- Grey Wind died the same night Robb did, he even "fuse" with the body of his owner in an awful way.
-Shaggydog, seems to have been captured than killed, and guess who is captured now ? (fyi : Rickon)
- Summer is quite troublesome to link (mostly because his death was not so long ago) , he sacrifice himself, to protect the others, my guess is, Hodor's death, bran will feel double time guilty, because he crushed the life of Hodor by controling him (by a perfectly time-loop effect I didn't thought I would see in GoT) and because hodor sacrificed himself, not so completly willingly. That guilt may cause a part of bran to die, just like Summer was to him.
I don't think his death means bran's one because he has an enormous plot potential, his death would only be a waste (just like Jon's was).
- When Nymeria being thrown away, was a realy huge default in my theory until some time ago when we learned the she must throw herself away to become a faceless man.
- and last but not least : Ghost (who due to other theory on Jon I believe is absolutely not from the same blood of the other) was always by Jon's side except when he couldn't be himself.