Jack has started 29 games in three years for the Bruins. His 2015 campaign was cut short due to a knee injury. This is an explosive playmaker with a unique skill set. He lines up all over the field on defense, including inside linebacker, outside linebacker and nickel cornerback. Against the run, he has the quickness to shoot gaps as well as the strength to play off blocks. He has a violent punch to take on and separate from blockers and he's quick to locate and close on the ball. He's at his best in pass coverage, where he can mirror tight ends, running backs and even wide receivers. There are games where he covers in the slot and he makes it look easy. He has also carried the ball on offense and he has NFL starting ability at running back as well. He has vision, balance and an explosive burst with the ball in his hands. Overall, Jack has tremendous value because of his ability to dominate at multiple positions.