Now, I'm pretty sure that most of us know that Sebastian Stan is signed for about 5 or 6 films with Marvel -- but unless there are 3 more Cap films and a flashback appearance in the Avengers he just can't be in the films! Or can he?
I remember reading an issue of the Avengers, one of the earlier ones -- and a while after Cap is unfrozen, he sees Bucky! But how is this possible? Didn't Bucky die? Well the thing is he did (well not really, that's how he can be the Winter Soldier in other films). Who he actually saw was Rick Jones -- So what if Rick Jones is in the Avengers films or even another Captain America film? Just a quick thought.