I liked Bell a lot at MSU. He was an absolute monster when they played Boise. The drills are showing the game speed he has. Very little momentum lost when he cuts back. 24 Reps at 225 for a his size shows really good upper body strength as well.
Monte Ball, on the other hand is having a rough combine. 4.62 40 at 215 pounds. He looks stiff and slow off of his cuts and in the weight room and for a pretty big back he put up 15 reps.