Or because they don't think he belongs in the category of the guys I listed. From what I've seen, most think Bijan Robison was a better prospect.
At any rate, we will get an objective measure of his athletic ability at the Combine. If he can combine great speed and quickness with his vision and ability to break tackles then he'll probably end up being a top 5 pick. But, he could also end up being Mark Ingram which IMO would mean that he would not be BPA at #9.