Mark Barron is an excellent strong safety prospect, but he's no Eric Berry. Mark Barron didn't participate in the 40-yard dash, the 10-yard split, either the vertical or broad jump, or the bench press.
Had he worked out and looked good, then he could have boosted his stock enough for the Titans to consider taking him in the first round. However, since he sat out, he didn't do enough to separate himself from other strong safeties.
Kentucky's Winston Guy Jr. had a great weigh-in and a decent 40 time.
Delano Howell also did very well, especially since he was coming off an injury.
Boise State's George Iokla and Notre Dame's Harrison Smith did even better. Iokla ran a 4.59 second 40 and had 20 reps on the bench, and Smith ran a 4.56 second 40 and had 19 reps.
Given that all of those guys will be available much later in the draft, why would the Titans spend their first pick on a guy who they can't be sure about physically?