Zimmerman is a good tackler. Good size, play maker, forces fumbles, turnover machine, good in coverage, and an INT machine. But looks smaller than listed size
Brooks has decent speed, and is a hard hitter. He is a bit undersized, and needs to wrap up better on tackles
Joyner has good speed, and is a good tackler, Although he is a really tiny DB, and is not the best in coverage
Addison has good size, and is a good play makier on defense. Good tackler. Just not the fastest Safety.
Darby is a decent tackler, and a hard hitter. Misses some easy tackles, gets beat by fast backs, and a small safety
Clinton-Dix has good size, and good speed. Sure fire tackler, and a play maker. He does get beat on easy routes.