If Cam Ward was coming back then sure.
With what will undoubtedly be a drastic drop off in QB play, having an actual ELITE RB should be paramount.
Betting on the run game, with a worse QB & seemingly losing Martinez, with only 2 backs currently on the roster with any productivity is a gamble in odds that doesn't favor the unlucky.
Oh ST already had a 1200yd back in Treveyon Henderson, but they still brought in Quinshon Judkins when he became available. Why? Because adding great players to your team makes winning easier.
Hughes is better than every RB on the team, that's not debatable.