Marshall is signed because Fins currently have 3 health RB's.
Need a camp body and a RB for pre-season game.
If not mistaken, D. Thomas is sitting out practice and game this week. Gillislee just hurt his hammy, Moreno has yet to take contact and likely wont for another week or two, Williams may or may not play this weekend, he practiced after getting carted off the field vs Falcons.
As it stands, Dolphins gave Miller and Darkwa ready to go.
Miller likely plays two or three series with rest of the 1's. Darkwa wont play entire game, so a RB is needed.