Former NFL running back Maurice Jones-Drew rates the 32 NFL running backs. He has new Dolphins running back Jordan Howard at number 30:
“Howard is in this spot for several reasons. He is several years removed from a 1,000-yard rushing season and is in a new scheme on a rebuilding team. He's also recovering from a shoulder injury that kept him out for the final six games of last season and will be sharing the backfield with Matt Breida.”
Thirtieth seems to me to be a bit low for Howard. There’s every reason to believe that the shoulder will be fully healed.