Originally Posted by TheHeatKitchen
There's not much to flashback to. They've shown basically everything relevant in his past.
We could be seeing flashbacks to the '40s to juxtapose them with the present and see just how much alien the world is to Steve and everything he's lost.
But it could be a flashback from Steve's perspective about Bucky. Before the war, or even during. We didn't get to see a whole lot of Bucky on his own in CATFA, pretty much all we know about him is that he's very loyal to Steve.
Ed Brubaker had established that Bucky had a bit of a trouble-making streak before the war, and during the war, he was the guy with the job of getting his hands dirty so that Cap wouldn't. It'd be interesting to explore that, IMO.