I'm not sure I would call his 40 time "blazing fast for his position". That is good speed but it is also the same as Micah Johnson's and he had problems staying with receivers when he had to. I'm not trying to rain on your parade but just saying speed is not his best attribute.
Micah got so muscle bound during his time at UK that he did get slower. I think it was the Army AA game that he ran down an AA running back from the opposite side of the field so he was fast coming out of high school.