Here's what CBS says about Thomas..
Read & React: Recognizes what's coming quickly and has the speed to get to the spot to make a play. As a safety, he was a bit overaggressive, biting on play-action and underneath routes which leaves cornerbacks on an island.
Man Coverage: Needs technique work before making the move to cornerback. Backpedal is high and slow, and lags in recovery on double moves and catching up to receivers running quick outs or square-ins. Has the speed to turn and run with receivers.
Zone Coverage: Attacks throws in front of him and has good range as a safety. Can make the interception or a big hit to separate the man from the ball. Makes quarterbacks pay for late throws over the middle, baiting them into making poor decisions. Excellent hand-eye coordination.
Closing/Recovery: Very good burst and closing speed to the ball. Wins most battles for the ball in the air. Slow to plant and drive in coverage but can close when the play is in front of him. Recovers from false steps to get back to receivers.
Run Support: Willing to support the run. Flies into the action at full speed, pounding backs in the open field. Will overpursue and fail to break down, missing tackles. Will struggle to get off receiver or lineman blocks.
Tackling: Inconsistent as a tackler in space despite good statistics. Larger receivers and tough running backs run through his tackles in space. Ends up riding big receivers for a few yards before bringing them down. A special teams force in college and will be used there in the pros.