he ran a 4.67 40 at his pro day.
Tried to find that number, not sure where it's from.
This was on USAToday:
At just over six feet tall and 202 pounds, DeJean ran a 4.42 40-yard dash as timed by an NFL scout. He posted a 10-yard split of 1.55 seconds and vertical jump of 38.5 inches.
Sports Illustrated's article:
According to The 33rd Team and other reports, DeJean ran his 40-yard dash in 4.43 seconds on Monday. He added a 38.5-inch vertical leap and a 10-foot-4 broad jump. All of that at a sturdy 6-foot 1/2 and 203 pounds.
If someone did time him at 4.67, that would explain his big drop, but I can't find that number anywhere. I don't know what's correct, but his lack of speed doesn't seem part of the most common narrative out there on him and why teams passed on him.