Yep. A lot of good WR's ran slow times. Hell, the best of all time ran a high 4.6. But Jarrett's issue is seperation. You man up on him and he's done. At 4.67 he's going to struggle to do that consistently. He's not a big moves guy at the LOS.
Plus he had an extra month to train and he still shat the bed. Jarrett is notoriously lazy and his work ethic is very questionable. This won't help.
Isn't he very strong though? Shouldn't that aid him in gaining seperation with a bit of NFL coaching? Not saying USC coaching is inferior, but his technique would surely get more attention from an NFL coaching staff. He has great hands which is more than can be said for some of our receivers.