To fill Johnson's roster spot, they had a couple of options.
Another player they tried out was Maryland fullback Cory Jackson, according to Aaron Wilson of National Football Post.
Johnson was seeing fullback time and Jackson is a fullback so they were probably looking at him as a replacement for camp.
Wilson passes along a quote from Maryland head coach Ralph Friedgen two years ago: "He might be our MVP and unsung hero. He does all the dirty work. When he's playing well, we're playing well. It definitely had an impact on our running game."
Sounds like he's got some characteristics that the Chiefs like.
Expect more of these roster moves, workouts as camp goes on. It's really like a chess game when it comes to filling roster spots and finding guys for training camp. I'd like to be a fly on the wall for some of these discussions between GM Scott Pioli and head coach Todd Haley.