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.

it's established that the films take place in the now named Marvel Cinematic Universe alternate reality, so pretty much no continuity from 616 has any bearing, just the themes.

@CATPANEXE: But what I'm saying is that since it is influenced by the comics and there was a quick reference to Rick Jones in TIH, I think it could be possible, really I see no other way that he could be in 4 or 5 more films, unless Cap has quite a few flashbacks in each of the Avengers movies and he's in the Cap sequel(s)

@Mr.Hulk_Smashin'! said:

@CATPANEXE: But what I'm saying is that since it is influenced by the comics and there was a quick reference to Rick Jones in TIH, I think it could be possible, really I see no other way that he could be in 4 or 5 more films, unless Cap has quite a few flashbacks in each of the Avengers movies and he's in the Cap sequel(s)

He has a contract for 6 films. It doesn't guarantee that he will be in 6. Just if Marvel calls upon him to make appearances or cameos, it is in his contract to do so over anything that he might have planned in the future.