Cunningham is considers to be the best RB as pass protection on the team. He has Value.
Mason was unimpressive after his rookie season, I just wonder how much my opinion is skewed after having to watch him AFTER Gurley took a breather.
Rams have a close knit team, and Fisher has his finger on the pulse of the locker room. He is criticized as a coach often but even the most rabid Fisher hater will tell you, he's a players coach and and bad locker room guys aren't as much of a concern. If he thought it would be a problem, he wouldn't have even tried him out.