Jerrell Harris had great speed, but couldn't tackle. That's why he was on the bench & not a starter( other than the KO team).
Harris eventually wised up and had a solid senior season.
As for the assertion that we lack speed....compared to last year, I would agree. No one could get to the edge on our defense last year while teams like Ole Miss, Texas A&M, LSU, and even Mississippi State have been able to do it this year.
There were warning signs but we refused to see them because we were winning and winning handily. The LSU and A&M games exposed our weaknesses on defense and revealed that we are missing those 3 first round draft picks as well as the other starters we lost who went in later rounds.