Crossbones is a major Captain America villain, so seeing the deep cover Hydra operative return for one more adventure would definitely satisfy a portion of the fanbase.
It would be hard to deny that seeing Crossbones (who initially debuted in Captain America: The Winter Soldier) come back for a proper sendoff could be a good thing for many fans of the Marvel Cinematic Universe.
The character’s presence in Captain America: Civil War was teased (primarily through leaked set photos) as a major aspect of the film’s narrative; still, he found himself unceremoniously blown up only a few minutes into the movie’s story.