EW.com posted the following Spoilers about Morgan and his relationship with Casey and Alex:
Q: What’s Morgan going to be up to on Chuck? — LaurieLabels: Adam Baldwin, Chuck, Joshua Gomez, Mekenna Melvin, NBC, Season 4, Spoilers
A: Well, if you watched last night’s episode (and you really should have), you saw that Morgan stepped up to protect John Casey’s secret second assignment with the GRETAs (who are no more)! According to co-creator Chris Fedak, that somewhat speaks to the relationship the writers are building between the two. “We have some really funny stuff coming up in regard to the odd couple that is Morgan Grimes and Col. John Casey. It’s a peculiar decision to decide to room with your girlfriend’s dad. But they’re also very good friends and Morgan needed a place to crash,” he dishes. “Going forward, we really like the idea of Morgan as Chuck season 1, the guy who’s experiencing the spy world anew, fresh. We have some really interesting ideas about where we’re going with him in this season and how it all folds back to John Casey and his girlfriend Alex.” And if things get out of hand, it’s good to know that Sarah always has her tranq gun.