Civil War "“ ghosts from the past

According to the same sources, the entire African market scene is set by Crossbones. But his reasons are different than just payback on the Avengers. Thus, after the events of Captain America: The Winter Soldier, Crossbones will be bent on getting the Winter Soldier back into the fold, as HYDRA's assassin. Of course, this scene does actually open the Civil War.

As far as Iron Man is concerned, the Registration Act is just what he needed in order to find the Winter Soldier, who is responsible for the deaths of his parents. So, after all, Tony Stark is just being his former self, acting for the most selfish reasons.

According to the same sources, Civil War is important not just for setting the future Avengers roster, but also for Bucky Barnes, since during it he will have to get everybody on his side. How come? Simply because he will become a very important character in the MCU.