In my case, especially with drafted or UDFA RB, it's wanting to see the player in real action and not getting to see the player in real action.It could also be that the Dolphins haven’t offered him a spot on their PS. I think there were some posters on here who were more impressed by Doaks that the Dolphins or the other teams around the league appear to be.
With RB if they never get a carry in the regular season, it's disappointing. And may have more to do with their blocking, assignment soundness, etc., than their running ability.
As a fan I want to see their running ability in the pros with my own eyes.