Potential: When you look at Jeremy Cash's mind-boggling numbers, the thing that stands out first and foremost is the amount of tackles he makes behind the line of scrimmage. Duke uses Cash as what they call their "Strike" strong safety role. A hybrid safety/linebacker/nickelback, Cash has all the physical attributes of a safety, but primarily lines up over the slot receiver which allows Duke to use him in coverage or as an extra linebacker depending on the matchup.
Cash should not be viewed as a linebacker/safety tweener just because of the way Duke chooses to use him. Cash has plenty of athleticism, downfield cover skills and ball skills to play cover one, two, three or straight up man to man. NFL teams will boost his stock value based on the fact he has the ability to cover today's freakishly sized tight ends.
Another major positive teams which will draw teams to Cash is his IQ on and off the field. They don't just let anybody into Duke, and when you listen to Cash speak in interviews and with the media it is obvious he is a well-rounded individual who also has a grasp of life outside of football. On the field, his intelligence shows up in his leadership, understanding of his own defensive scheme as well as opposing offensive schemes, and outstanding instincts which plays a big factor in the amount of turnovers he forces.
Currently Cash is viewed as a top fifty prospect, borderline first round, with a lot riding on his 40 time and performance in individual drills. His speed and fluidity are good but not great, so as long as he posts respectable numbers and shows at least a half-way decent ability to turn and run he should be an excellent value pick early in the second round.