Jayne had so many discordant parts in the show. He complained about work, but when Mal didn't have work for them, he complained even worse and talked about how his pop always said that if someone didn't have work he wasn't looking hard enough. He's this hired killer, but one hat from his mom turns him into a marshmallow. I mean, it's just fascinating all this bits and pieces that float to the surface, so I'm trying to give him a backstory that would account for such an interesting man.