"What other holes do you need filled in? I might be able to help," Bucky offers. "Though I've still got some holes, too. I still don't know who any of you actually are-- except for Walker, and I wish I didn't know who he is, and I kind of vaguely know about the Red Guardian. By reputation." Because one of his handlers told him he was easier to manage than Alexei was, once, in a very patronizing tone. There's a little grimace on his face at the unspoken memory, but probably easy enough to chalk up to being about Walker.