Holding on to the ball is real concern....but aside from that, I think he can get the job done and done well. Because he's only carried the ball as running back about 90 times in the last two years combined, I think we forget that he is actually good at it. We get used to him swinging out catching a ball in the flat, or even way down field.
When he lines up behind the QB and gets the ball, he's a good runner. He's fast, he's strong, he's elusive, and he's a freaking load these days at at over 225 lbs. I think he can be good....he's never gotten the chance. He carried the ball almost as much his freshman year as the last two combined. That's what I remember. I remember him averaging almost a whole yard more per carry than Tate or Lester that year.
The good thing is that Malzahn will use whoever is best in that spot. If it's Aycock, he'll get it. If it's Dyer, he'll get it. If it's Fannin, he'll get it.