HUNTING MODULE.
The more I see comparison gifs like these, the more I think - you don’t carve the out the person and leave the skills - that is not what they did at all. They kept everything of the person (even gave him some more skills) and took the memories. What you have left is a being who is a hunter, who is a killer, who is loyal, who is protective, who is sassy and talks back, etc, and who is up for grabs. Without the memories to inform WHO to protect, WHO to be loyal to, WHO (and what) it is worth killing for, they can manipulate the character traits into being protective of them, of being loyal to them, of killing for them.
In some respects, that may be even worse, when he regains his memories. Because everything he did as Winter Soldier is still him. He cannot look at those events and say - that was not me - because it was. He was not a robot acting on programming - he was him, acting on false information.
TOO REAL