You don't give a player who has his history of injuries a raise, especially if his contract is no longer buriable. Worst case scenario: He comes back 'healthy' but unable to play at the NHL level. Now you have to send him down and have a $100,000 cap hit. And if you don't think that could matter, look at Toronto this season.
Because he's only a fringe NHL player who is coming off of serious injuries and this reducing the Hawks' ability to weaponize their cap space come trade deadline.