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Maybe this has been addressed but in Winter Soldier and in the comics Bucky was an enhanced human like Steve Rogers. In the movie he was so bad arse that it took multiple avengers to stop him and even then Cap had to make him remember to stop him, they even built a movie around him. All of a sudden he is this normal guy with a mechanical arm who seems clumsy and not really powerful. Hell black widow was scared of him. Why did they strip him down?
I mean, Bucky jumped out of a plane and hit the ground without dying or breaking anything. I think that counts as enhanced. He also held his own against the other Super Soldiers while the others were getting smashed. I do think they toned him down a bit to keep the fighting interesting, but I think they are still showing him as enhanced.