15. Khalil Mack
The Chicago Bears are paying Khalil Mack an astounding amount of money. He will see a guaranteed $24 million this year. He has a huge deal but has to prove he deserves it.

Mack has yet to win a playoff game with the Bears. Furthermore, he was not half as dominant last season as he should be with the money he is commanding. In short, Mack needs to step it up and maximize his potential if he really is a top-five defensive player.