Jarrett’s Pro day time is worse than it looks on the surface.
Prior to the combine Jarrett worked with trainers to get a decent 40 time but could not get out of the 4.7’s, so he did not run at the combine.
So instead of running at the combine, he continued to work hard with speed trainers and dropped his weight to 214 lbs, ran on turf with a breeze behind him (though not a significant one) and posts a 4.67 and a 4.62 at his Pro Day, where players almost always post better than at the combine..
For a guy 6-4 he did not have a great vertical or broad jump and his 3 cone drill was unimpressive.
However, speed is just one of the red flags on Jarrett's play. Others include that he doesn't play terribly physically for a big guy, he struggle to get of the line when pressed and some scouts question how he will handled being pressed by the stronger, more aggressive CB's in the NFL.
I have also heard whispers/questions about his intelligence -- especially related to recognizing coverage’s. Most scouts question his route-running, which I would guess most will admit leave something to be desired.
While I have heard some praise Jarrett's confidence in this ability, I have heard others counter with questioning his maturity. He sure does not like to hear any one question any of the potential flaws in his game -- saying he flips from dismissive to full blown denial that he has anything to work on.
On the plus he has great size and is long which is nice when combined with good hands. In fairness I should add that he has great technique for a WR as a blocker -- again something that great coaching has contributed.
Don’t forget that the USC spin machine has made many players look good in their program, and through hype get GM’s to ignore obvious red flags because of their production in the machine. The names Williams and White are a couple of recent examples of guys who have done nothing in the PRO’s yet the talking heads all declared them can’t miss based upon their USC production -- beware of Pete Carroll and the USC hype machine.