How is it that Samuel L. Jackson’s Nick Fury has been in the Marvel Cinematic Universe (MCU) since the very beginning, and never been the lead character in a single MCU movie or TV show?

"I didn't see the scar until a week after, because by the time he'd come out, it was all bandaged up. I thought it would be a little nick, but it was quite a big cut. "It wasn't clear what had ...