JRob is slow by SEC RB standards. He ran a 4.7 at combine. After his highlight against UK I feel like he tried to bounce runs outside too much and this lack of speed was evident. Look no further than the safety in the Bama game. I also think this is why Shump got more and more PT as time went on. Shump is faster than JRob. JRob was just hard to find in the hole and had a low center of gravity/hard to tackle.