Sebastian Stan's comments about Bucky Barnes' arc in the MCU indicate that a return to service as with the Avengers would have to undo his happy ending. Arguably, one of the questions he gets asked most is "Do you feel Bucky Barnes got justice?" Recently, Sebastian Stan reflected on Bucky's MCU arc and emotional journey, saying that Bucky's "had plenty of moments and we got him to a good place, so that's what I'm happy about." While Bucky's MCU future is still unknown, if he were to suit up again as an Avenger, it could result in a step backward for his recovery.
Bucky Barnes has been part of the MCU since 2011's Captain America: The First Avenger and has been through a traumatic journey to reach his happy ending. He was presumed dead after falling down a mountain on a mission with Steve in World War II, but was actually captured by Hydra, fitted with a metal arm, and brainwashed into becoming the Winter Soldier assassin. Captain America: The Winter Soldier and Captain America: Civil War slowly brought the war hero back from the brink after a lifetime of Hydra-sanctioned murder, only for him to be snapped from existence by Thanos in Avengers: Infinity War. When he did return once again in Avengers: Endgame, he ended up having to say goodbye to his one true friend.
Related: Winter Soldier vs White Wolf: What’s Next For Bucky's MCU Future?
With the Disney+ show, The Falcon and the Winter Soldier Bucky finally managed to work through his pain and make amends with everyone he hurt as the Winter Soldier. The show ends with Bucky joining the new Captain America Sam Wilson and fully re-entering society. Even when he was recovering in Wakanda there was a stoic seriousness about him, but now the weight of being the Winter Soldier
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