A lot easier to give a 3rd down back the ball up the middle 15 when you're under center and a team has to account for you hitting a receiver for 15+ every play (Tyler). Look at Forte in the NFL.
He's just not a spread option every down back. He'll be able to pick what NFL camp he wants to go to in May because most of them will be calling, but we didn't do him any favors his senior year. Oh well. Only difference in being drafted in the 4th on and being a UFA is UFA's get to pick their team. Same $$$$.