Draft profile on him....
STRENGTHS Productive tackler and three-year starter. All-time leader in Georgia Tech history in tackles for a defensive back with 283. When in position, will make square, physical hits to end the play. Comes from high to low quickly and under control. Uses length to close down running lanes toward sidelines. Monitors quarterback's eyes from zone coverage and shows discipline in his coverage. Outstanding work ethic. Great student on and off field with his master's in building and facility management.
WEAKNESSES Slow twitch. Lacking athleticism to be consistent factor in space. Can be a step slow to find proper angle for downhill tackle, missing 12 in 2014. Gets pre*occupied with receiver and doesn't maintain enough focus on running plays developing. Slow lateral transition, allowing separation for receivers. Feet get too heavy when asked to fire on throws and close the distance.
DRAFT PROJECTION Priority free agent
BOTTOM LINE Played in space and near the line of scrimmage, but he's best suited in a role that limits what is asked of him from a coverage standpoint. His intelligence, work ethic and play demeanor will all work in his favor, but his lack of functional speed and athleticism will not.
http://www.nfl.com/draft/2015/profiles/isaiah-johnson?id=2553291