Johnson, Denver's starting FB the last couple years. He is a pure fullback, a guy who does a great job as a lead blocker and can catch the ball pretty well out of the backfield.
With old fashioned Fullbacks being phased out by a lot of teams in favor of H-Back/TE types, Johnson isn't a fit for everyone. However, for a team that utilizes a FB in a traditional manner he is a great fit.