I think we'll see the new guy start to lose it before the end of this. In the comics he was as asshole who had a raging nationalist hard on for the government and military. He got super strength from the Power Broker (glad they're using him in this. Was wondering if they would after that fight when it turned out they all had strength). He went by the name "Super Patriot" and was super antagonistic towards Captain America, constantly attempting to discredit him. He was chosen to replace him when Steve gave up the identity after some of Red Skull's shenanigans. Once Walker was picked to take over the role, he attempted to use Steve as a role model and tried to emulate him but was kind of shit at it (because there's probably almost nobody that can emulate the moral integrity that he has) and after more Red Skull shenanigans, gave it up, eventually becoming U.S. Agent.
With that in mind, I'm kind of expecting him to get douchier over time as Sam and Bucky continue to blow him off until something happens that makes him have a complete meltdown and realize he can't do the job the way it needs to be done. I also like how they styled his outfit to kind of allude to the U.S. Agent outfit.
Right now it feels like this series is missing SOMETHING. Not sure what though, especially with how top heavy with "villains" it is between Flag Smasher, The Power Broker and Zemo. Also Walker sort of though he's more pseudo-antagonist than actual villain. I'm enjoying it, it just doesn't give me the kind of drive to watch it that I got from WandaVision though.
Really glad they included Isaiah Bradley in this. That whole thing was an interesting story in the comics from what I've read. Makes me wonder how many other people who have been Captain America in the comics they'll find a way to fit into this though.
There's a few bigger ones they could still use, excepting Jeffrey Mace since they made use of him in Agents of SHIELD.